fishfinders

I have a cuda 242 on my Adventure and it has survived many rough trips including being smashed and soaked on beach landings. It has been upside down in the ocean and dropped on my cement garage floor. It still works like new and I love it. I want to take it off my Adventure and put it on the Trident (my nearshore diving yak) and put a ff/gps on my Adventure (long range/offshore rig). I want to be able to go way out there for halibut in Humboldt and paddy hopping in So Cal.

I have a handheld gps but I would like a gps on my ff for when I am miles off shore. Redundant gps=safety. I don't know anything about other ff brands or ffs with gps. Are certain brands/models problematic? Should used be OK? Will discontinued models work with satellites?

I'm watching a Cuda 250 ff/gps on ebay. Is that a good model?