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Old 12-10-2017, 12:49   #16
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Join Date: Mar 2012
Location: Boston, MA
Boat: 1981 Bristol 32 Sloop
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Re: OpenCPN with Garmin GHC 20 autopilot

NMEA Revealed

NMEA Revealed

$ECRMB,A,0.000,R,?,NM001,2714.427,N,08018.831,W,0.1 48,166.032,0.000,V*2E

$GPRMB,A,0.66,L,003,004,4917.24,N,12309.57,W,001.3,052.5,000.5,V*0BField Number:

  1. Status, A= Active, V = Void
  2. Cross Track error - nautical miles
  3. Direction to Steer, Left or Right
  4. TO Waypoint ID
  5. FROM Waypoint ID
  6. Destination Waypoint Latitude
  7. N or S
  8. Destination Waypoint Longitude
  9. E or W
  10. Range to destination in nautical miles
  11. Bearing to destination in degrees True
  12. Destination closing velocity in knots
  13. Arrival Status, A = Arrival Circle Entered
  14. FAA mode indicator (NMEA 2.3 and later)
  15. Checksum

Example: $GPRMB,A,0.66,L,003,004,4917.24,N,12309.57,W,001.3 ,052.5,000.5,V*0B



Yes, it looks to me like it may have something to do with the names of the Waypoints and the fact that there is no To Waypoint Name.

But how do we know it will accept the RMC sentence?

It should as this is the "RMB - Recommended Minimum Navigation Information"

So next step is to get it well formed I guess.

Can you change the names of your waypoints to just be numbers, 3 digits and try that?

----
If that simple approach does not work, maybe you need to try using a beta plugin called oBabel by Mike R. [Rasbats]
I compiled that and tried some testing for him awhile ago and some have found it useful, but I've lost track of it.
It uses another well known program called GPS Babel that helps with conversions. You should read about that on the link.

oBabel helps to tranfer a route to garmin, if it works. Then you'd use that for the autopilot.

I've read that Garmin is very particular about their waypoint names and cannot have greater than a certain number of places (5 I think) and must be a number etc.. Read oBabel and gpsbabel it will help you I think.
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