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DIGITAL INTERFACE
GGA -Global positioning system fix data
$--GGA,hhmmss.ss,llll.lll,a,yyyyy.yyy,a,x,xx,x.x,x.x,M,x.x,M,x.x,xxxx*hh<CR><LF>
1. UTC of position
2. Latitude, N/S
3. Longitude, E/W
4. GPS quality indicator (0: No fix, 1: GPS, 2: Differential, 8: Demo mode)
5. Number of satllite in use,00-12, may be different from the number in view
6. Horizontal dilution of precision
7. Antenna altitude above/below mean sealevel, m
8. Geoidal separation, m
9. Age of differential GPS data
10. Differential reference station ID, 0000-1023
11. Checksum
GLL - Geographic position, latitude and longitude
$--GLL,llll.lll,a,yyyyy.yyy,a,hhmmss.ss,A,a*hh<CR><LF>
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+---+----------------------------------- 1
1. Latitude, N/S
2. Longitude, E/W
3. UTC of position
4. Status: A=data valid, V=data invalid
5. Mode indicator(see note)
6. Checksum
NOTE Positioning system Mode indicator:
A = Autonomous
D = Differential
S = Simulator
N = Data not valid
The Mode indicator field supplements the Status field. The Status field shall be
set to V=invalid for all values of Operating Mode except for A=Autonomous and
D=Differential. The positioning system Mode indicator and Status field shall not
be null fields.
A-12
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+----+--------------------------------- 3
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+---+--------------------------------------------- 2
+------------------------------------------------------------- 1
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+---------------- 3
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+------+----------------------- 2
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+---+------------------ 7
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+------------------------- 6
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| +------------------------------- 4
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| | +------- 6
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+----------- 4
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+-- 11
+---- 10
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