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Originally Posted by sparksandtabs
Is the actual positioning data hard to interpret?
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Data streaming out of most GPS devices conforms to the NEMA standard for information. There is a formatted string that identifies the rest of the data in that line. There are several lines per updated data packet output from the GPS receiver. The specifications for the NEMA strings can be found online. If you know a little bit about dealing with ASCII strings, then it is quite easy to parse out the data you need (lat, lon, heading, etc) from the NEMA data packet. Some GPS receivers will allow you to turn off data strings that you don't care about (Like the Garmin 18-5Mhz that my team used). This will decrease the time between new data packets.