Garmin GT20-TM Questions

[adesalvo]

I am getting interference with my garmin plus cv fish finder and my fishawk x2 that both run on 77khz. 
 

I already have them on other sides of the boat   but when the garmin is on 77khz the fishawk displays that error code. When I swap to 200 it starts working. I don’t like 200 as I can’t really see my downrigger balls and 77 lets me see fish chasing my setup.  
 

I have the GT-20tm transducer but it appears it only supports 77/200.  I use the word appears because on the manual the fish finder itself states it supports dual frequency 55/200.  
 

can I just set the fish finder to 50/200 or will I burn out the transducer?

 

 

Edited May 11, 2021 by adesalvo