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Old 18-08-2022, 07:58   #1
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Maughidhoo's Avatar

Join Date: Sep 2012
Location: Berlin
Boat: Wharram Tiki 38
Posts: 13
STW reading half what it should be

The STW readings on my opencpn (also open marine and mxtommy) show apron 50% lower value than they really are. The main nav system on the boat is a Raymarine system with an itc-5 for converting the log paddle wheel signals into the system. On the Raymarine network the STW reading agrees with the SOG and seems to display sensible values.

A vYacht router transfers the SeaTalk NG / NMEA 2000 data to the pc / RPi.

Maybe somebody has encountered a similar issue and knows the solution or a possibility to calibrate STW values in opencpn or similar.
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