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Step 5Understanding the Output
The GPS15L is able to output in either NMEA 0183 v2 or NMEA 0183 v3 sentences. NMEA 0183 is just a fancy name for saying that the unit outputs text sentences in a certain format. This is the format that is pretty much universal between GPS units for output of the data. Thankfully, the manual for the GPS15L/H describes each of these sentences in detail.
When you first start up the 15L it outputs a whole bunch of different sentences. In the robotics application I used this for, I turned off every other sentence except for the Recommended Minimum Specific GPS/TRANSIT Data (RMC). The following is an example of this sentence.
$GPRMC,163126,V,4335.2521,N,08446.0900,W,000.0,173.2,051206,006.1,W*62
The sentence contains longitude, latitude, speed over ground, course over ground, and much more helpful information. Be aware that if you disable all of the sentences except RMC, when you go to use the unit with non-custom software, some of the features may depend on the other sentences. I'll next show you how to modify the settings on the 15L/H.
When you first start up the 15L it outputs a whole bunch of different sentences. In the robotics application I used this for, I turned off every other sentence except for the Recommended Minimum Specific GPS/TRANSIT Data (RMC). The following is an example of this sentence.
$GPRMC,163126,V,4335.2521,N,08446.0900,W,000.0,173.2,051206,006.1,W*62
The sentence contains longitude, latitude, speed over ground, course over ground, and much more helpful information. Be aware that if you disable all of the sentences except RMC, when you go to use the unit with non-custom software, some of the features may depend on the other sentences. I'll next show you how to modify the settings on the 15L/H.
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