Raymarine evo getting nuts if log is stuck

[Flod]

I installed a new Ray evo 200 and connected it both to my nmea2000 network (where my ais, gps and lowrance plotter are connected) and to my old seatalk network where my Tridata are connected. Everything worked fine. One day my log "wheel " got stuck under the boat due to some mussels growing on it and the instrument started to show 0 knots. Then I engaged the autopilot and the boat started to go like a snake in the water. Obviously it thought we where going 0 knots as well. I tried to find a way to get it to trust the gps signal instead but didn't managed. Then I disconnect the old seatalk network and then it worked again. Later I cleaned the log and everything started to work again. This thing happened 2-3 times over the season.
Anybody knows how to set which speed source the evo should use?


Sent from my iPhone using Cruisers Sailing Forum