I dont if anyone here knows much about transducers, but. I have a garmin fishfinder "240 Blue", which is now full of water and knackered.
By chance I also have a garmin ff 80, I tried it on the plug in the boat and it worked, the trouble is, its a different shape and not easy to mount.
The knackered one is an old model and hard to find.
What I would like to know is if the transducers are common to a lot of garmin fishfinders, if so I could get a more up to date unit and simply plug it in.
If your thinking "why not change the transducer?", Its because it is under the engine and a real git to get at.