Furuno BB FAR28x7 - Manual (Page 264)

APPENDIX
AP-16
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
| | | | | | | | | | | | |
| | | | | | | | | | | | +--- 10
| | | | | | | | | | | +----- 9
| | | | | | | | | +--+------- 8
| | | | | | | | +--------------- 7
| | | | | | | +--------------------- 6
| | | | | | +------------------------- 5
| | | | +---+---------------------------- 4
| | +---+---------------------------------------- 3
| +--------------------------------------------------- 2
+---------------------------------------------------------- 1
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:
A = Autonomous
D = Differential
E = Estimated (dead reckoning)
M = Manual input
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.
Data is used in case of A=data valid and A and D. Data is not used in
case of V=data invalid, E, M, S and N.