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.

Previous Page: Introduction

A developer could develop his or her own custom NMEA interpreter in a few hours for non-commercial use.

Next Page: The Core of A GPS Interpreter

Chapter three explains the basics of an NMEA interpreter: processing strings.