When setting up a Garmin 178c with an Airmar tilted element transducer, I hit MENU and scoll down to transducer freq. set up. Should I use the 200/50 option or they have a "customer select" option where you enter in your own values. The manual makes no mention of this. Just thought since the brands are different more info to the Garmin would be better. But what values to enter?? Thanks for your help and good fishing.
