gday blue ,I,ve just got the littliest hummingbird and I find it suits my needs------ seeing the bottom, showing depth and occassionally showing me some fish. lol .It navigates me around shallow waters that i know at night without running aground (too often ).Mate it all depends on what u require but if its just 4 the creeks and rivers ,and out in the bay reefs u dont really need to spend that much.