I lose SOG whenever I select a waypoint to go to

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum PGrady,

I suspect that the problem is resulting from a data loop. These commonly occur when NMEA 0183 devices have not been correctly interfaced to the system, have been incorrectly configured to loop data received via their NMEA 0183 port, or the design of the NMEA 0183 device loops data but is not user configurable. Should you provided a system diagram listing each of the make/model of each of the devices which have been interfaced to your marine electronics system and identifying how these devices have been interfaced to one another, then we may be able to advise regarding how to correct the problem.