Cayman Systems 2E-H-W Bedienungsanleitung PDF herunterladen (Seite 33)

NMEA Manual based on MediaTek chipset - Manual

5 FIX Valid Flag

This chapter concerns only the UP500 antenna module.

It is important to note that the current UP500 receiver firmware output position coordinates in RMC and

GGA messages even if the position is flagged as invalid in the NMEA RMC message.

This is contrary to most other GPS receivers, and the consequence is that a trace displayed on a map might look

inaccurate. The advantage for some applications is that you do get some kind of position even if you know the

output is not validated.

This is a feature that can very easily be filtered by monitoring Valid "A“ ”lag and invalid "V“ ”lag in the RMC

message.

Here is an example of a NOT VALID output fix:

$GPRMC,000040.026,V,6016.3376,N,02458.3604,E,0.00,0.00,060180,,,N*73

$GPVTG,0.00,T,,M,0.00,N,0.00,K,N*32

$GPGGA,000041.026,6016.3376,N,02458.3604,E,0,0,,130.5,M,19.5,M,,*42

$GPGSA,A,1,,,,,,,,,,,,,,,*1E

$GPGSV,1,1,00*79

And here is an example of a VALID output fix:

$GPRMC,065343.000,A,6016.3204,N,02458.3279,E,0.02,0.00,190309,,,A*69

$GPVTG,0.00,T,,M,0.02,N,0.03,K,A*3C

$GPGGA,065344.000,6016.3206,N,02458.3278,E,1,7,1.06,29.3,M,19.5,M,,*6A

$GPGSA,A,3,03,22,16,21,27,06,08,,,,,,1.33,1.06,0.81*01

$GPGSV,3,1,12,06,66,201,48,03,65,236,48,22,56,163,48,21,30,090,42*7E

$GPGSV,3,2,12,37,21,183,,08,14,331,34,16,13,204,33,27,09,026,33*76

$GPGSV,3,3,12,07,03,296,30,19,,,45,18,,,48,15,,,37*4C

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Cayman Systems 2E-H-W Bedienungsanleitung Seite 33