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2
votes
1answer
246 views
Current time from GPRMC or GPZDA?
In GPRMC there is a time field, called fix time. Can I consider this always the same as value from GPZDA time? Is there any possibility that when GPS device is configured to stream both GPRMC and ...
1
vote
0answers
69 views
Will NMEA support the GNxx string in future?
At the moment there is no problem when using GPS only devices, NMEA string with information about speed, DOP value etc starts with GP.. prefix. But with Glonass included NMEA string has different ...
2
votes
0answers
94 views
How to configure various client applications to display AVL data?
Given x number of GPS units transmitting NMEA formatted strings back to a server (xxx.xxx.xxx.xxx:xxxxx) is there a way to listen in on the traffic and parse NMEA formatted strings for display on a ...
12
votes
3answers
1k views
GPS Tracking by SMS
I have a GPS Tracker which sends the GPRMC string of the NMEA 0183 protocol, at fixed periodicity, to a predefined number as SMS. I am looking for a software which can port these incoming SMS to a COM ...
17
votes
6answers
1k views
How correct is the “Accuracy” value given by GPS devices?
I have a Garmin Forerunner 305 and a Google Nexus One Android phone. From the GPS on both these devices I can get a "Accuracy" value that is usually between 6-20 meters. How much can I trust this ...
5
votes
1answer
545 views
Calculating absolute precision confidence number from Dilution of Precision indicators from GPS receiver
End-user GPS receivers typically show an absolute confidence indication, such as Within 25 Metres, for the calculated position.
I am parsing NMEA data from a GPS unit and wan't to calculate a similar ...
