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How to Write a GPS Application - Introduction

jperson

Introduction

Sample Image - WritingGPSApplications1.jpgWhat is it that GPS applications need to be good enough to use in a commercial environment, such as in-car navigation? Also, how does the process of interpreting GPS data actually work? In this two-part series, I will cover both topics and give you the skills you need to write a commercial-grade GPS application that works with a majority of GPS devices in the industry today.

One Powerful Sentence

This first part in the series will explore the task of interpreting raw GPS data. Fortunately, the task is simplified thanks to the National Marine Electronics Association (www.nmea.org) which introduced a standard for the industry now in use by a vast majority of GPS devices. To give developers a head start, I chose to use some Visual Studio.NET source code from my “GPS.NET Global Positioning SDK” component. (The code is stripped of features like multithreading and error handling for brevity.)

NMEA data is sent as comma-delimited “sentences” which contain information based on the first word of the sentence. There are over fifty kinds of sentences, yet an interpreter really only needs to handle a few to get the job done. The most common NMEA sentence of all is the “Recommended Minimum” sentence, which begins with “$GPRMC.” Here is an example:

$GPRMC,040302.663,A,3939.7,N,10506.6,W,0.27,358.86,200804,,*1A

This one sentence contains nearly everything a GPS application needs: latitude, longitude, speed, bearing, satellite-derived time, fix status and magnetic variation.

Jon Person is the author of the award-winning “GPS.NET” software now in use in over two thousand GPS applications in all industries, from geocaching to disease outbreak prevention. Jon runs his company, "GeoFrameworks," from his home office in Denver, Colorado. As a hobby, Jon enjoys storm chasing in the Great Plains in May and June each year. On May 4th, 2007, Jon witnessed the EF5 tornado that destroyed Greensburg, Kansas, and volunteered for nearly a month to help them rebuild. A photo journal of his efforts can be found here: http://www.flickr.com/photos/jonperson/sets. Jon also maintains a YouTube page with storm chasing videos here: http://www.youtube.com/user/jperson2007. All feedback and suggestions are welcome. Jon can be reached at jperson@geoframeworks.com

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