Don't hurt to have a spare, I have a spare everything (almost)
Probably be faster if you just order one on line as mine are on the boat at the lake. Not sure why they have so many problems with them but I do know if you run your ping speed higher than factory setting, it can shorten ducer life considerably, that's the one setting I don't touch. Order the 200mhz only, they are cheaper and you don't need dual frequency on the lakes.
Anytime you want to hop on The Barge just let me know, I fsh allot and I'm always looking for someone to fish with, especially when it's windy. Solo is fine when yu get a day with not much wind, problem is the weatherman never get it right..