Calibrating Temp on Transducer

[fmoore]

I have an FCV 620 with a B60 ducer on the boat. I have a feeling the temp is off a bit. Is this as simple as getting a temp reading with a reliable thermometer and offsetting the temp on the unit or is there something more to it? That just sounds too easy to me but I can't figure out any different way.

Thanks
Fintan

[seavee capt]

I've got the same problem, mine is off about 10 degrees consistently. Anybody with input? I'd appreciate it.

[misokat]

Most units have a offset setting in the setup menu, usally wont allow more than 10 degrees offset though, check your manuals.

[SNAKE EYES SPORTFISHING]

what we do is when alot of boaters are on the dock everyone turn the unit on, and see whats going on, now i know this isn't real syphisticated but its got to get you close