Raymarine forum

What should the default B164 Speed Offset setting be programmed on a C90W interfaced with a DSM370?
Select Speed Transducer... Auto
Frequency Calibration
Depth Offset... 1.4' (Trophy 2302)
Speed Offset... ??? (requires a percentage and 000% is not an option)
Temperature Offset... 0.0F

For the DSM, I currently have:
SONAR Interference Rejection... Auto
2nd Echo Interference Rejection... Off (Not sure what this is for or if it should be in Low)
Ping Rate Limit... 32 (the default setting)
Ping Enable... Enabled

Welcome to the Raymarine Forum Jett,

Some fishfinder transducers feature a speed through water paddlewheel to permit the interfaced system to report speed through water data. The B164 transducer (photo shown below) is not such a transducer and as such speed transducer selection and speed offset are not applicable and these settings may be ignored.