Why does the “n” for the location display update twice as fast as the “n” for the altitude in the Static Position panel?
Static Position Panel: GPSy re-calculates the average position, altitude, and DOP every time that data is transmitted to the unit. Many GPS units transmit multiple sentences in each NMEA “paragraph” (or cycle) and often information is duplicated. As you can see from the NMEA sentence info, the location data is transmitted in several sentences (GGA, RMC, GLL) while altitude and DOP data is only transmitted in fewer. As it turns out, location information is often transmitted twice while altitude/DOP is only transmitted once. This is why the “n” for location updates much faster than the other two.
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