Furuno 511 - Manual (Page 15)

3. STEERING MODE
13
1.5 Error Messages
Your equipment displays error messages to alert you to potential equipment
trouble.
Error message Meaning Remedy
ABNORMAL
WIND DATA Wind angle exceeds 90%/s, or
wind speed exceeds 20 kt/s. Check the wind sensor and its
connection.
NO WIND DATA Wind data is not input.
Press the [STBY] key to go to
STBY mode, and then check the
appropriate sensor.