Need to get a new fish finder soon. I have a Garmin through hull but wanted to know if transducers are generic and a Garmin would work on a Humminbird and so forth.

Also any suggestions on Fishfinders around 250 to 300 dollars. I have been looking at the Humminbird 727

I fish mainly around the bay and go as far as the CLT. I have a 23ft WAC.