"Vessel speed is very slow" Error message on 711c

[boom]

I have a sailboat with TZT2 Furuno MFD, 711c Navpilot and other B&G equipment/sensors. The paddle wheel boat speed sensor is currently dirty & stuck and an autopilot alarm message/beep comes up every few seconds on the 711c. See picture. I have to acknowledge it to clear the error message, which is very annoying after few times.

When I'm sailing, how can I stop the alarm (except for cleaning the paddle wheel) from coming up every few seconds?

When I check the 711c Alarm menu, the speed alarm is OFF. Is there any other setting that will turn off this error message?

Thank you.

 

[TheReaper]

It isn't an alarm, but rather an error message. See explanation of error.


If you remove the STW source from the Sensor Selection menu on the NAVpilot 711C and ensure that the SOG source is set to the GPS sensor on the boat, that should get rid of the error message until the paddlewheel is cleaned. Once cleaned, the STW source can be re-added in Sensor Selection menu.