En el botn select coordinate System elegimos el sistema de orgen. Exploring the world of free tools for GIS, GPS, Google Earth, neogeography, and more. Because the Earth is curved and in GIS we deal with flat map projections, we need to accommodate both the curved and flat views of the world. Therefore, the NADCON computed transformations are extrapolations and no accuracy can be stated.. How to notate a grace note at the start of a bar with lilypond? Unfortunately, NAD27 is not a simple mathmatical formula. The datum was redefined and recomputed, resulting in NAD83, which is . The following projection file converts an NAD27 dataset to an NAD83 dataset: The following keywords (and associated regional coverage) are valid datum names when using the NADCON method for datum transformation. Description: (0,) Covered area powered by MapTiler United States (USA) - Delaware and Maryland. Remarks: Parameter file is from NAD27 to NAD83 (4) (code 1313) assuming that NAD83 is equivalent to WGS 84 within the accuracy of the transformation. If you are marking property boundaries, building roads, or planning for coastal inundation scenarios, you must know about and use the correct geodetic datums. To transform datums, specify different input and output datums with the DATUM subcommand in a projection file. Even today, geodesists are continually improving horizontal geodetic datums. Enter "1" for East longitudes, "-1" for West longitudes, and make sure your longitude degree value is always positive; or, enter a "1", and then enter positive and negative values for the longitude degree value. This set of horizontal positions formed the basis for the North American Datum of 1983 (NAD83). Log in . I've been asked by some users of my Spreadsheet if i could add the the conversion from WGS84 to NAD27. Chris, try this link out http://www.gpsu.co.uk/. NAD27 uses all horizontal geodetic surveys collected at this time using a least-square adjustment. Geodetic datums like the North American Datum 1983 (NAD83) form the basis of coordinates of all horizontal positions for Canada and the United States. SPCS DEMs SPCS imagery Here's an example. An example is 52 12. There also may be problems running this in Excel, as it seems to want a password for some functions; however, it runs fine on the free Office clone LibreOffice.. Cartisan Maps has several free spreadsheet tools for basic coordinate conversions; each one can handle up to 5000 sets of coordinates. ), Question: Did I actually transform my data points from WGS84 to NAD27? On the other hand, if we use CORS coordinates data, or the OPUS service, the NAD83 reference frame to which these There is no exact mathematical equation that will convert data built from a surface oriented local datum like NAD27, to an earth centered global datum like NAD83. Due to differences in the method for defining each datum, as well as variations in distortion, the relationship between the NAD27 datum and NAD83 datum cannot be defined at every location by a single mathematical equation. proj4js cannot transform nad27 datums to nad83 correctly. Assigning the CRS does not transform the data. Currently, all states have been resurveyed. We reference all coordinates on Earth to a datum. READ MORE: Datum Transformations Converting Coordinates from NAD27 to NAD83, Image credit: NADCON North American Datum Conversion Utility, Clarke 1880 was never used in North America. Datums precisely specify each location on Earths surface in latitude and longitude. Data can be post as file or as an URL link - as well as the result. It may not display this or other websites correctly. Does a summoned creature play immediately after being summoned by a ready action? Can anyone recommend a good app for multiple datum transformations? In case you have coordinates in CSV file somewhere online, you can call this request: Thanks for contributing an answer to Geographic Information Systems Stack Exchange! Guest chris n maria, For example, the National Geodetic Survey has adjusted the NAD83 datum four times since the original geodetic datum estimation in 1986. Your previous content has been restored. In near offshore regions, results will be less accurate, but seldom in excess of 5.0 meters. Over time, surveyors have gathered a massive collection of surface measurements to more reliably estimate the ellipsoid. In this case, a datum transformation is necessary. - Caleb Pitman Aug 4, 2016 at 21:34 3 You'll want to use some third party tools to do the transform. What is EPSG4326? What is the incorrect result for your conversion. Asking for help, clarification, or responding to other answers. Linear Algebra - Linear transformation question. Proj4js returns in datum NAD83 [ -104.998634, 39.74619740515981 ], From http://tagis.dep.wv.gov/convert/ If you preorder a special airline meal (e.g. Copyright 2000-2023 Groundspeak, Inc. DBA Geocaching. You may have on-the-fly transformations on for your project. The World Geodetic System (WGS) is a standard used in cartography, geodesy, and satellite navigation including GPS.The current version, WGS 84, defines an Earth-centered, Earth-fixed coordinate system and a geodetic datum, and also describes the associated Earth Gravitational Model (EGM) and World Magnetic Model (WMM). Macro/VBA to add text from another cell into current cell when I type a certain value. If any of . Result is 39.748289809487346 -104.99917122555918. i made the assumption that ellps value unchanged without knowing what extact projection your data is in. The GRS80 reference ellipsoid has a semi-major axis of 6,378,137.0 meters and a semi-minor axis of 6,356,752.3 meters. Surveyors could measure any point with a latitude and longitude away from this reference point based on the Clarke Ellipsoid of 1866. There is really no single computation capable of adequately handling that type of conversion (well). To learn more, see our tips on writing great answers. What the above-mentioned C source-code does is simply use the two data files as data arrays and offsets into them and interpolates between the 4 numbers that would be up-left, up-right, down-left, down-right from the location you want to convert. Does a summoned creature play immediately after being summoned by a ready action? your ~ 50 meters. Scope: (null/copy) Approximation for medium and low accuracy applications assuming equality between plate-fixed static and earth-fixed dynamic CRSs, ignoring static/dynamic CRS differences. This is a result of the difference between the size and origin of the two spheroids on which the data is being projected. Find centralized, trusted content and collaborate around the technologies you use most. For example, ArcMap has seven formulas that convert from NAD27 to NAD83. When you transform NAD83 and NAD27 geographic coordinates to projected State Plane coordinates, it is the same projection method. geographic transformations and how to choose the right one, 25 Map Types: Brilliant Ideas to Build Unbeatable Maps, Epic Web Maps The Maps Hall of Fame [Best Maps]. It only takes a minute to sign up. I would recommend proj4js. The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. We reference all coordinates on Earth to a horizontal datum. A datum defines the following parameters for an ellipsoid: The North American datum of 1983 (NAD83) is the current horizontal or geometric datum for the United States. I converted NAD27 to NAD83 and put on google maps and it was about the same as WGS84 (maybe 5-8 ft difference). Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. In this case, you would need to perform a datum transformation. Canada - Quebec. Having failed to recently update I delete them attempted to download again. What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? For example, USGS topographic maps generally were published using a NAD27 datum. Display as a link instead, A datum describes the shape of the Earth in mathematical terms. How to convert WGS84 to NAD27 in pygeodesy? . And can you share your projections info? A minimum curvature-derived surface based on the National Geodetic Reference System determines the transformation of points and has an approximate accuracy of 0.15 to 0.5 meters. You should see the difference between the projections, i.e. Do new devs get fired if they can't solve a certain bug? Select a popular spatial reference system from the drop-down list or choose a custom system to enter the functioning EPSG code by yourself. National Spatial Reference System and current survey standard using multi-year adjusted locations based on GNSS from the CORS. Especially, this is true when using historical data. GDAL/OGR are fairly robust and open source that are made for this. A geodetic datum uniquely defines all locations on Earth with coordinates. All files are processed on our servers. http://www.ngs.noaa.gov/cgi-bin/nadcon.prl. Because maps were created in different geodetic datums throughout history, datum transformations are often necessary. It provides latitude and longitude and some height information using the reference ellipsoid GRS80. Is a list of projection packages, many public domain with source. For example, USGS topographic maps generally were published using a NAD27 datum. The arc should be approximately 200 meters longer. If you can read C source code (not that hard), I have a program (with the source code included) on my Web site (http://jdmcox.com), named Convert SDTS Data, that converts from NAD27 to NAD83 (I know, you want to convert in the opposite direction (retrogression?). Scope: (null/copy) Approximation for medium and low accuracy applications assuming equality between plate-fixed static and earth-fixed dynamic CRSs, ignoring static/dynamic CRS differences. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? The early attempts at measuring the ellipsoid used small amounts of data and did not represent the true shape of the Earth. Click Add. In 1983, surveyors eventually replaced the NAD27 with NAD83. ", "+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=hgridshift +grids=us_noaa_conus.tif +step +proj=hgridshift +grids=us_noaa_MD.tif +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1", "https://proj.org/schemas/v0.5/projjson.schema.json", '+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=hgridshift +grids=us_noaa_conus.tif +step +proj=hgridshift +grids=us_noaa_MD.tif +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1'. Can I tell police to wait and call a lawyer when served with a search warrant? vegan) just to try it, does this inconvenience the caterers and staff? How can I take a NAD27 decimal coordinate like 39.748303,-104.998634 and convert it to NAD83 or WGS84 with a programming function in PHP or JS? (PHP Syntax), From an array of objects, extract value of a property as array. Posted on 1 second ago; June 24, 2022 . Convertir coordenadas UTM NAD27 a WGS84 en ArcGIS - YouTube 0:00 / 6:33 Introduccin Convertir coordenadas UTM NAD27 a WGS84 en ArcGIS ngel A. Gonzlez 35 subscribers Subscribe 36. and HARN could combine uncertainties (that is, NAD27 to HARN equals 0.15 m + 0.05 m = 0.20 m). I have around 10,000 coordinates . Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Thanks in advance. You can open imagerywith a world file. Because where would you be on Earth without having reference to it? A number of methods have been proposed for performing the datum adjustment. Have you research the problem? All Rights Reserved. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. By I once had an app on my iPhone called Map Tools which was a datum transformation tool. Surveyors gathered approximately 26,000 stations in the United States and Canada. To learn more, see our tips on writing great answers. Newer realizations of NAD83, such as NAD83 (CORS96) and NAD83 (2011) can differ from NAD83 (1986) by a meter or so. Using QGIS, I loaded my shapefile into one layer and set the CRS to WGS84, then I loaded the same data again and set its layer to NAD27. Enter coordinates, select input and output reference system. If you are marking property or land boundaries or building roads or planning for coastal inundation scenarios, you must know about and use the correct geodetic datums. Datum shifts happen because survey measurements improve. If you have an account, sign in now to post with your account. You can also use command line utilities to convert your coordinates: One way to use gdaltransform is to start a terminal session (OSGeo4W if you are on Windows) and interactively execute: EPSG stands for European Petroleum Survey Group. Be mindful of geographic transformations and how to choose the right one. The Add Coordinate Format dialog will appear. Input the coordinates in a decimal degrees (DD) format. Click this link to visit the forums. The latitude and longitude location in the NAD27 datum differs from NAD83 or WGS84. If your data is already in NAD27, do not use these options. How to transform data points from WGS84 to NAD27? We reference all coordinates to a datum. This page has an example of converting state plane to WGS84: . Comments are currently closed; feel free to contact me with questions/issues. The Global Positioning System (GPS) references the World Geodetic System (WGS84) as its coordinate reference system. See also: Proper gdaltransform syntax to transform a list of coordinates? 1720. NAD27 coordinates are presently used for broadcast authorizations Transformations between old datums (NAD27, Old Hawaiian, Puerto Rico, etc.) Thus, when the receiver tell us that the computed coordinates using GPS observations are referred to the WGS84, they actually mean WGS84(G1150). Why do small African island nations perform better than African continental nations, considering democracy and human development? Thanks for contributing an answer to Stack Overflow! convert nad27 to wgs84 formula. And even today, people continue to change geodetic datums in an effort to make them more accurate. For example, EPSG:4326 and EPSG:4267 are reference codes for WGS84 and NAD27, respectively: will return the corresponding coordinate in NAD27. NAD83 corrects some of the distortions from NAD27 over distance by using a more dense set of positions from terrestrial and Doppler satellite data. This tool permits the user to convert latitude and longitude between decimal degrees and degrees, minutes, and seconds. Upload or insert images from URL. Connect and share knowledge within a single location that is structured and easy to search. Lightweighted projection library https://github.com/proj4js/proj4js. For a better experience, please enable JavaScript in your browser before proceeding. NAD_1927_To_NAD_1983_6. Pasted as rich text. A coordinate transformation is done through a series of mathematical equations. You'll want to use some third party tools to do the transform. When combining data from different users or eras, it is important to transform all information into common geodetic datums. Powered by Invision Community. What video game is Charlie playing in Poker Face S01E07? The default NAD27 to WGS84 transformation is NAD_1927_To_WGS_1984_1, . To see this for yourself, you can create a coverage of a single arc, running along a meridian from the equator to your point of interest in the coterminous United States. Never before have we been able to estimate the ellipsoid with such precision because of the global set of measurements provided by GPS. Before the current datum, cartographers created maps using different starting points. Geodetic datums form the basis of coordinates of all horizontal positions on Earth. One only has to look as some GPSr's and software to see the number of "different" NAD27 datum conversions to realize it's not a simple mathematical type of conversion. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. About an argument in Famine, Affluence and Morality. Reference codes may be found at spatialreference.org. A regular grid of control points whose datum shifts are known is used to estimate the shift at other locations. 3. Enter 1 for East longitudes, -1 for West longitudes, and make sure your longitude degree value is always positive; or, enter a 1, and then enter positive and negative values for the longitude degree value. This effort, known as HARN or HPGN, is a cooperative project between the National Geodetic Survey and individual states. I was hoping to see a difference between the two layers, but I saw none. Scientists believe the error is less than 2 centimeters to the center mass. List of supported states in Accuracy and uncertainty. November 18, 2021 | | premier league goalkeeper rules | crewe homecoming 2021 Open Source GIS: A GRASS GIS Approach - Page ii UTM <-> Latitude/Longitude online converter Convert nad27 to decimal degrees" Keyword Found Websites . Depending on where you are in North America, NAD27 and NAD83 may differ in tens of meters for horizontal accuracy. It wasnt until the mainstream use of Global Positioning Systems (GPS) that we developed a unified global ellipsoid model. MERCEDES Thanks for contributing an answer to Geographic Information Systems Stack Exchange! Conversions between NAD27 and WGS84. The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup, On the fly transformation From WGS84 to NAD27 with proj4 code, Transform from WGS84 to Cylindrical Equal Area, Transform coordinates in csv file from wgs84 to nad27 using qgis, Troubleshooting the use of OpenLayers Plugin layers with Midvatten Plugin in QGIS. To convert into various coordinate formats, we freely offer our Excel template. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. This is a PHP-Class for geographic coordinates transformation using proj4 definitions. Clear editor. help with formula to convert GPS degrees minutes seconds to decimal degrees. Click on the "Convert" button. Where does this (supposedly) Gibson quote come from? Surveyors installed brass or aluminum disks at each reference location. I suspect the group that originated the app got bought out or has disbanded. (I never took any GIS classes in school, and I've only been working at this for a few weeks.). Has anyone else used this app and experienced the same thing? To convert between feet and metric dimensions they will be converted based on the U.S. Survey foot definition, . However, because the geodetic datums were different, the resulting projected coordinates will also be different. NAD27 is the adjustment of long-baseline surveys. I know it can be done with GIS programs, but I need a programming function ideally in PHP, but I could convert from any language. The history of datums The primary thing you ought to be cautious about is that the physical areas have not changed. Because we created maps using different geodetic datums throughout history, datum transformations are often necessary when using historical data. This converts between NAD27 and NAD83 (1986) using the NADCON transformation. If a law is new but its interpretation is vague, can the courts directly ask the drafters the intent and official interpretation of their law? When you do click on the datum, it shows various parameters that it uses. United States (USA) - Delaware and Maryland. Your email address will not be published. Why Are Great Circles the Shortest Flight Path? He has a program used to make conversions between coordinates and datums - work nice. Click Open Map (appears after the end of the conversion) to visualize the converted coordinates on the World map. Please see the popular list below. Area of use: United States (USA) - Delaware and Maryland. The North American datum of 1983 (NAD 83) is the United States horizontal or geometric datum. The geodetic datum is an integral part of projections. Right-click total to add Max, Min, Count, Average. I know QGIS could do the conversion, but I need a function for my purposes. What is the correct way to screw wall and ceiling drywalls? So if you do a transformation with Save As from EPSG:4326 into EPSG:32064, the points of the WGS84 and BLM14 layer should be on top of each other. Enter a meaningful name under the Info string field. Most historical USGS topographic maps and projects by the US Army Corps of Engineers used NAD27 as a reference system. Powered by EPSG database 10.076, "Uses NADCON method which expects longitudes positive west; EPSG GeogCRS NAD27 (code 4267) and NAD83 (code 4269) have longitudes positive east. Continually Operating Reference Stations (CORS) are composed of permanently operating Global Positioning System (GPS) receivers. Canadian Spatial Reference System and Canadian Active Control System with GPS processing. NADCON is the accepted national standard and is the fastest, simplest, and most accurate datum transformation for mapping at scales of 1:200 and smaller. Because that is incorrect: How to transform data points from WGS84 to NAD27? Theoretically Correct vs Practical Notation. If you have questions about obtaining a more reliable transformation in major urban centers or other areas that are densified, contact ESRI Canada Limited for further details. The Canadian National Transformation predicts to within 0.01 meters of the actual difference for 74 percent of the cases, and within 0.5 meters for 93 percent of the cases. Surveyors chose Kansas as a common reference point because it was near the center of the contiguous United States. Canadas standard transformation program between NAD27 and NAD83 was developed by the Canadian Geodetic Survey. Read More. The difference between the phonemes /p/ and /b/ in Japanese. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? Not quite sure if I understood you right, but I assume your data got projected on the fly. - YouTube GIS: Convert NAD27 to WGS84 with programming function like PHPHelpful? At a geodetic or ellipsoidal height h, . ", "(null/copy) Approximation for medium and low accuracy applications assuming equality between plate-fixed static and earth-fixed dynamic CRSs, ignoring static/dynamic CRS differences. The North American Datum of 1983 (NAD 83) is a unified horizontal or geometric datum and successor to NAD27 providing a spatial reference for Canada and the United States. Where does this (supposedly) Gibson quote come from? What am I doing wrong here in the PlotLegends specification? 10 comments caleb87 commented on Oct 5, 2016 proj4php/proj4php#53 Making statements based on opinion; back them up with references or personal experience. You cannot paste images directly. I don't need to be perfect. How do you ensure that a red herring doesn't violate Chekhov's gun? For example, NAD27, NAD83, and WGS84 are the most common geodetic datums in North America. Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. I have to process millions of records, so an API would likely be too slow. Earth bulges out more at the equator than at the poles by about 70,000 feet. Cartisan Map Coordinate Converter: Enter latitude and longitude in separate columns for degrees, minutes and seconds, and have them converted to a DD MM SS string, DD MM.d string, or numeric decimal degrees. In near offshore regions, results will be less accurate but seldom in excess of 5.0 m. Farther offshore, NAD27 was undefined. These points are in West Texas, where NAD27 differs from WGS84 by about 50 meters. This difference is known as a datum shift. This will give you access to the Nadcon box at the bottom of the window, where you must click the Browse button to locate the conus.las file obtained in Step 1. OKMap GPS Mapping Software For The Beta-Adventurous, Spreadsheet Tools For Lat/Long, MGRS and UTM Coordinate Conversions, Degree-Minute-Second To Decimal Degree Converter, Coordinate Converters III Two Freeware Converters, Coordinate Converters I NAD Conversions, Options For MGRS Coordinate Conversion And Viewing. These files are also included with the source code (they were on the Web (they're public domain)). You have successfully reported the error, You will get the notification email when error is fixed. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. UTM (Universal Transverse Mercator) is a coordinate system that is based on the WGS84 ellipsoid. JavaScript is disabled. Surveyors referenced al coordinates to Kansas Meades Ranch (391326.686 north latitude, 983230.506 west longitude) for the NAD27 datum. Get your coordinates in the WGS84 on your display. How to convert WGS84 to NAD27 in pygeodesy? Not the answer you're looking for? October 2009 3 Step 4: Add a New Conversion Click the Add button to open the Add/Edit Conversion window. Experiencing transformation anomalies when performing a Save As to convert coordinates between NAD83-Z14 and NAD27-Z13. Unfortunately, NAD83 is not the only datum youll encounter. Try setting the NAD_1927_To_WGS_1984_2 transformation in ArcMap. Surly Straggler vs. other types of steel frames. Has 90% of ice around Antarctica disappeared in less than a decade? So convenient!!! Select the Input SRS (the default format is WGS84). Using this app is a fast and easy way to get coordinates in the WGS84 by automatically converting the coordinates of any Spatial Reference System (SRS) or EPSG code. Projection: 32629 Home | Upload Your Own | List user-contributed references | List all references Makes no sense to me but perhaps it will help you. Then select Nadcon (NGS) from the Type option list. I checked the properties of the layers, and one says +datum=WGS84, while the other says +datum=NAD27. Double-click on any point on the map, and you'll get a text box with the coordinates at that position in lat/long and MGRS, in the program's native WGS84 datum and the one you selected above: WGS84: N35.3125633 W111.693389 12SVE3696807927 NAD27: N35.3125304 W111.692657 12SVQ3703307724 Lat/long shift: 66.5 m E, 4.1 m N, 66.7 m total Most survey monuments have not moved. How is an ETF fee calculated in a trade that ends in less than a year? The WGS84 datum. The photo shown is a benchmark, not a triangulation station. But now I cant find it when I search within my apps. For any type of work where coordinates need to be consistent with each other, you must use the same geodetic datum. Well done. Proj4php is an OSGeo community project. Your email address will not be published. From the unified network of survey monuments, the result of triangulation was the North American Datum of 1927 (NAD 27). For convenience, a link is included to the National Geodetic Survey's NADCON program, which allows conversions between the NAD83 / WGS84 coordinate system and the older NAD27 coordinate system. Therefore, the Nadcon computed transformations are extrapolations and no accuracy can be stated." Thanks, Rod. To more clearly see the difference, relative to your Google Maps points (which may be in a different CRS), load the layer, defining it as having a CRS as WGS84 (probably accurate), then right-click on the layer and choose Save As, defining your project CRS of NAD27(BLM14) for the resultant file. Coordinates on a map then the input redirector, '<', will feed your data in, and the output redirector, '>', will write output.txt, which will look like. The standard is published and maintained by the United States National . You will get the conversion to result in the Output reference system window. Depending on where you are in North America, NAD27 and NAD83 may differ in tens of meters for horizontal accuracy. NADCON, an acronym for North American Datum Conversion, is a datum transformation program created by the U.S. National Geodetic Survey (NGS). Similar to NAD 83, it uses the Earths center mass as the coordinate origin. Assigning the CRS does not transform the data. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Is the Earth Round? Before the current datum was defined, many maps were created using different starting points. A common problem is when different coordinate locations are stored in different reference systems. This conversion uses the Esri transformation NAD_1927_To_NAD_1983_NADCON. Required fields are marked *, Datum Transformations Converting Coordinates from NAD27 to NAD83. Why do many companies reject expired SSL certificates as bugs in bug bounties? The average correction between NAD27 and NAD83 is an average of 0.349 northward and 1.822 eastward. - Mintx Aug 4, 2016 at 21:42 The radio waves transmitted by GPS satellites enable extremely precise Earth measurements across continents and oceans. For all practical applications, NAD83 is the same as WGS84. The best method these days is using distortion models which I believe is used with things like NADCON, http://www.ngs.noaa.gov/TOOLS/Nadcon/Nadcon.html. Your NAD83 coordinates turn into WGS84 less than a minute. I had previously found that it sometimes had to be deleted, reloaded to work. I'll investigate the information you have all provided and see if it helps. Not really. This converter applet will convert a single pair of UTM coordinates to latitude/longitude using formulas and constants for the North American Datum of 1927 (NAD27, Clarke Ellipsoid of 1866).
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