Garmin Y cable setups for CHIRP vs non-chirp units ...:

QUOTE=Todd Driscoll;8667088]For echoMAP CHIRP, 73 and 93:

Y cable: 010-12445-33 https://buy.garmin.com/en-US/US/p/pn/010-12445-33

GT15M-IH: 010-12402-00 https://buy.garmin.com/en-US/US/p/530269
or
GT8HW-IH: 010-12401-10 https://buy.garmin.com/en-US/US/p/573584

GT30: 010-01961-00 https://buy.garmin.com/en-US/US/p/540582

Only the GT30 (Side and ClearVu only) works in this combo. EchoMAPs only support one 2D sonar source, and the other xducers that offer Side and ClearVu also have 2D sonar and will not work with the y-cable.[/QUOTE]