WCV - Waypoint closure velocity
$--WCV,x.x,N,c--c,a*hh<CR><LF>
1. Velocity component, knots
2. Waypoint identifier
3. Mode indicator(see note)
4. Checksum
NOTE Positioning system Mode indicator:
The positioning system Mode indicator field shall not be a null field.
WNC - Distance, waypoint to waypoint
WPL - Waypoint location
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| | +------- 4
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| +--------- 3
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| +--+----------- 2
+--+---------------- 1
A = Autonomous
D = Differential
S = Simulator
N = Data not valid
$--WNC,x.x,N,x.x,K,c--c,c--c*hh<CR><LF>
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| +--+--------------- 2
+--+--------------------- 1
1. Distance, nautcal miles
2. Distance, km
3. To waypoint identifier
4. FROM waypoint identifier
5. CHecksum
$--WPL,llll.lll,a,yyyyy.yyy,a,c--c*hh<CR><LF>
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+-----+---------------------------- 1
1. Waypoint latitude, N/S
2. Waypoint longitude, E/W
3. Waypoint identifier
4. Checksum
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+--- 5
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+------- 4
| | +------------ 3
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| +--------- 4
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| +------------ 3
+-----+---------------- 2
DIGITAL INTERFACE
A-17