According to the accessories list all 3 of those units use the same transducers.
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I see alot of the HDS units are sold with out a transducer. My question is are the ducers the same as some of the older units. I have a 332C right not with a shoot through hull ducer already in the boat. I also have an extra ducer that came with my 510C. Could save some money and the hassle of mounting another shoot through ducer if the ones I have will work with the new unit.
According to the accessories list all 3 of those units use the same transducers.
Fair Winds and Following Seas
Bill H. PTC USN Ret
Chesapeake, Va
The HD's have the ability to perform on 200 MHZ and 83MHZ at the same time to give you a split screen with two different angles of viewing. Check to make sure that the transducer also has both frequencies listed or you might be a little disappointed. Experience taught me that...:o