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Old 01-09-2011, 05:10   #1
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'Distance to Waypoint' Difference

I have Raymarine ST 60 instruments and a S3G autopilot. I take the GPS information from the autopilot via NMEA out to my computer (XP SP3) and I send the steering info to the autopilot via NMEA in. So when I have a route active I can see that information in the ST 60 instruments. But if I compare the distance to next waypoint I can see a value (RNG) on the computer (OpenCPN 2.5) and a value that is app 10% higher on the ST60 instrument. Also the waypoint from openCPN will come up on the radar, also with the same error. When I arrive to the waypoint both are zero.
Is there an explanation to this? Can I correct this error?
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Old 02-09-2011, 09:24   #2
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Re: 'Distance to Waypoint' Difference

Quote:
Originally Posted by janp391 View Post
I have Raymarine ST 60 instruments and a S3G autopilot. I take the GPS information from the autopilot via NMEA out to my computer (XP SP3) and I send the steering info to the autopilot via NMEA in. So when I have a route active I can see that information in the ST 60 instruments. But if I compare the distance to next waypoint I can see a value (RNG) on the computer (OpenCPN 2.5) and a value that is app 10% higher on the ST60 instrument. Also the waypoint from openCPN will come up on the radar, also with the same error. When I arrive to the waypoint both are zero.
Is there an explanation to this? Can I correct this error?
Check if your ST60 is set to show statute miles (=1609m) instead of nautical miles (= 1852m).

Thomas
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