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RMC- Recommended minimum specific GPS/TRANSIT data
$--RMC,hhmmss.ss,A,llll.lll,a,yyyyy.yyy,a,x.x,x.x,xxxxxx,x.x,a,a*hh<CR><LF>
1. UTC of position fix
2. Status: A=data valid, V=navigation receiver warning
3. Latitude, N/S
4. Longitude, E/W
5. Speed over ground, knots
6. Course over ground, degrees true
7. Date: dd/mm/yy
8. magnetic variation, degrees E/W
9. Mode indicator(see note)
10. Checksum
NOTE Positioning system Mode indicator:
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.
RTE - Routes
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+---+---------------------------------------- 3
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+--------------------------------------------------- 2
+---------------------------------------------------------- 1
A = Autonomous
D = Differential
S = Simulator
N = Data not valid
$--RTE,x.x,x.x,a,c--c,c--c,.....,c--c*hh<CR><LF>
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+----------------------------------- 2
+--------------------------------------- 1
1. Total number of messages being transmitted
2. Message number
3. Message mode:
c=complete route, all waypoints
w=working route, first listed waypoint is "FROM",
second is "TO" and remaining reset of route
4. Route identifier
5. Waypoint identifier
6. Waypoint "n" identifier
7. Checksum
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+--+------- 8
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+--------------- 7
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+---+---------------------------- 4
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+--------- 7
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+------------ 6
+----------------------- 5
DIGITAL INTERFACE
A-15
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