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[General GPS Information] [Satellite Status] [Government Sites] [Internet Mapping Programs] 
[Lat/Long to UTM] [GPS Software]  [GPS / Cartography Bibliography] 

General GPS information

Japanese Pages French Pages

Satellite Tracking

The View from Space

Distance/Bearing/Great Circle Calculators

Government GPS Sites

Internet Mapping Programs

Maps on CD-ROM & Map Vendors

Airport and other Waypoint Files

GIS Mapping Programs

Image Editing Tools

Other GIS Links

Grid and Map Overlays

Differential GPS (DGPS)

Cool GPS Hacks

Variometers/Barographs/Flightrecorders

Variometers are flight data instruments commonly used with hang-gliders and paragliders. They provide flight data information (altitude, lift rate, etc.) combined with moving map displays when used with GPS units. They also provide the all-important flight data recording needed in contests. -- tip of the hat to Alex Curlyo

You may also want to check out the various Mac/Win/Palm/Linux based software solutions as well.

Radio Modems for GPS Use

APRS/HAM/Misc

Wiring your GPS/NMEA/Misc.

Converting Latitude/Longitude to Universal Transverse Mercator (UTM)

On October 5th, 1996, I posted a request on sci.geo.geology and sci.geo.satellite-nav asking about conversion formulas between latitude/longitude and UTM coordinate systems. I was a bit overwhelmed by the response. All of them were excellent. I've included the responses below, the authors kindly gave me permission to reproduce their messages as well as other postings and resources that might be of use to people performing coordinate system or datum transformations.

One note of caution is reflected in Richard Koolish's message below. Depending on the geodetic datum used, your results vary when performing coordinate system transformations. Chuck Gantz's C source listed below allows you to select which datum you wish to perform the conversion in; and even handles the Swiss Grid.

Perhaps the best source code to steal/utilize is the free MacGPS source which is on Peter Bennet's GPS Resource site. It has routines to translate to and from UTM, Lat/Lon, ITM, OSGB, UPS, etc. People have ported MacGPS to LINUX/Windows/NT and other inferior operating systems, so you can find plenty of source code to work with based on MacGPS.

If all you need to do is run the calculations between geographic (lat/long) and UTM coordinates, then use either the Lotus 1-2-3 / Excel spreadsheet below, or:

The Coordinate System Overview is an exellent overview of why various coordinate systems and datums exist.

The book that should be on every coordinate system programmer's shelf is: 

  Map Projections - A Working Manual
  John P. Snyder.
  USGS Professional Paper 1395.
This text as well as a list of other "required reading" in GPS and cartography can be found in the GPS Bibliography.

I welcome contributions and additions to this page via e-mail at: karen@gpsy.com. However, due to my full-time jobs as a Macintosh GPS systems developer and sociocultural anthropologist, I am unable to provide much assistance beyond what is already covered on this page. I would suggest posting to the newsgroups or hiring a consultant (in which case I would be available: my time is your time if my time is your money).

For information on transformations to other grid systems:

A GPS Bibiliography

This is a collection of books on the Global Positioning System. It is not intended to be complete and is collated from various sources (thanks Sam Wormley). Contributions and suggestions can be made by sending e-mail to karen@gpsy.com.

Macintosh, Windows, and Newton GPS Programs (aka, our competition)

This page lists most of the currently available GPS communications programs for the Macintosh, Newton, and PC platforms. Despite being a provider of Mac-based GPS software, why include our competitors? Apart from our hubris in thinking GPSyTM and GPSy Pro TM are clearly superior, we think that expanding the (Macintosh) GPS market as a whole can only benefit everyone. Competition has greatly improved GPSy and will continue to push us into new avenues of development. Besides, the more high quality products for the Macintosh that are available, the better for everyone.

The more people who have GPS units on Wintel is also good for the Macintosh market since these people will eventually "forward migrate" to the Mac platform. At first glance it appears that there are more products for the Wintel platform, but the general quality of Windows software as a whole (not just GPS) is lower, so quantity gets made up in quality.

GPS Data Collection and Auto-Mapping Software

Mac Software Top 10

The following Macintosh software are products that GPSy® and her developers just couldn't be without:

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