Fish FInder Question
 

I just installed a Garmin 120 GPS Sounder. I got it for free. I dont no how good it is. But it works when i powerd it up in the garage. Im powering it off a 12v 7amp battery. I was wondering how much time i would get off that battery before it went dead??? Has anybody used this fish finder and do you like it?

Ok so that fish finder was a P.O.S. so i took it off. I just installed a new Humminbird 383 color GPS- fishfinder. im gana try it out tomm in la jolla. anybody els ever try this one???