The discrepancy between the converted and known coordinates is not due to an inaccuracy in GeogTools, but rather due to the conversion from feet to meters. This is because State Plane coordinates are often in U.S. Survey feet (3937 yards = 3600 meters) rather than international feet (1 ft = 0.3048 m).

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ExpertGPS isn't just a mapping tool and a GPS data manager, it's a powerful coordinate converter that can instantly convert between any coordinate format or datum. Whether you need to convert lat/lon coordinates to UTM or US state plane coordinates, convert NAD27 data to NAD83 or WGS84 datum, or reproject shapefile data to match the native projection of your GIS imagery or layers, ExpertGPS can accomplish the task - quickly, easily, and accurately.

Gps Coordinate Conversion Formula Calculator

We have created this converter and calculator to take decimal degrees or degrees and decimal minutes, and convert to the other. In order to establish a point, you MUST have latitude and longitude coordinates in one form or the other. You must enter both points to get a distance calculation. XYZ Coordinate Conversion (XYZWIN 2.0) Universal Transverse Mercator Coordinates (UTMS 2.1) State Plane Coordinates, NAD 83 (SPC83 2.1) State Plane Coordinates, NAD 27 (GPPCGP 2.0) U.S. National Grid (USNG 2.3) Latitude,Longitude,and Ellipsoid Height Transformations (NADCON) Orthometric Height Height Transformations (VERTCON). The formula assumes that the earth is a sphere, (we know that it is 'egg' shaped) but it is accurate enough. for our purposes. Enter the coordinates into the text boxes to try it out. It accepts a variety of formats. GPS positioning is based on trilateration, which is the method of determining position by measuring distances to points at known coordinates. At a minimum, trilateration requires 3 ranges to 3 known points. GPS point positioning, on the other hand, requires 4 “pseudoranges” to 4 satellites.

The Home Edition of ExpertGPS supports dozens of geographic coordinate formats, and dozens of datums. ExpertGPS Pro was designed for professional users who work with GIS shapefiles and CAD DXF drawings, or who need to convert US State Plane Coordinates.

ExpertGPS converts to and from any coordinate format or grid:

latitude/longitude
- decimal degrees
- degrees and minutes (deg min.min / DMM)
- degrees, minutes, and seconds (deg min sec / DMS)
Universal Transverse Mercator (UTM)
US State Plane Coordinates (requires ExpertGPS Pro)
US National Grid (ideal for first responders and emergency personnel)
Military Grid Reference System (MGRS)
British National Grid (BNG) and Irish Grid
Canada Grids (ATS, CSRS)
Australia Grids (VICGRID, GDA, AGD)
plus dozens more national grids and coordinate systems, for every country on Earth

ExpertGPS converts to and from any GPS or map datum:

WGS84 and WGS74
NAD83 and NAD27
ETRF 1989, Ordnance Survey 1936 and European 1950
and hundreds of other datums used in Canada, Australia, Europe, and throughout the world

How to Convert Coordinates using ExpertGPS

Step 1: Configure your input and output coordinate formats

To add a coordinate format in ExpertGPS, click Preferences on the Edit menu, and click on the My Coordinate Formats tab. Click Add. The Add Coordinate Format dialog will appear. On the left is an expandable list of all of the continents, countries, and US states. As you expand the location tree, ExpertGPS will show the coordinate formats used in that region on the right side of the dialog. Drill-down in the location side as far as you need to go to see the coordinate format for your location. Select the coordinate format, and then choose the appropriate datum from the list below.

Step 2: Add or import your data

You can add waypoints by hand, draw waypoints or tracks on the map, receive data from your GPS, or import it into ExpertGPS from KML, CSV, a shapefile, CAD drawing, or other mapping format.

Step 3: Select your output coordinate format

As soon as you switch to your output coordinate format by selecting it from the My Coordinate Formats list, ExpertGPS will reproject all of your data to the new format and datum. Your data is converted, and ready for use. You can export it to another mapping, CAD, or GIS program, or copy and paste it into Excel.

Three easy steps, and your coordinates have been converted

ExpertGPS makes coordinate conversion quick, easy, and accurate

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Download now and start your free trial of ExpertGPS 7.39
New features were added to ExpertGPS on Mar 30, 2021
ExpertGPS runs on Windows 10, 8.1, and 7.

Solutions to Common Coordinate Conversion Problems

Most problems involving GPS and map coordinate mis-matches are due to choosing the incorrect coordinate format and datum at some point in the process. If you are entering GPS coordinates by hand into ExpertGPS from a book or a Web page, you need to ensure that you've selected the same coordinate format and datum that the source's author used, or position errors will occur.

There are four main types of coordinate formats used throughout the world today: lat/lon, UTM, US State Plane, and National Grids.

Lat/lon coordinates:

There are three different ways to express latitude and longitude:
1. decimal degrees. (42.12345ºN, -71.23456ºW) Note that there are no spaces in these coordinates.
2. degrees and minutes (42º 23.456'N, -71º 43.632'W) Marine, aviation, and geocaching coordinates are usually given in deg min.min format. Note that there is a space between the degrees (º) and the minutes (') part of the coordinates.
3. degrees, minutes, and seconds. (42º 34' 54.234'N, -71º 24' 14.234'W) Civil survey and some marine waypoints are given in this format. Note that there are three parts to each coordinate, separated by spaces, and that three symbols are used to show the degrees, minutes, and seconds (º ' ').

UTM coordinates

Universal Transverse Mercator (UTM) coordinates are used worldwide. Unlike lat/lon, which is a spherical coordinate system based on angles, UTM, state plane, and national grid coordinates are rectangular grid systems where coordinates are expressed as Northings and Eastings from a fixed reference point. Rectangular grids make it much easier to calculate distances and to plot locations on a rectangular map. UTM coordinates look like this: 2346212N, 12343523E, 18T. The first value is the Northing. The second is the Easting. The third value (always a number between 1 and 60 followed by a single letter) is the UTM zone identifier. If your data is in UTM coordinates, it is very likely in NAD27 datum or WGS84 datum (see below). The vast majority of UTM data is expressed in meters. If you are using UTM data collected prior to 1983 by a US sta