I just purchased a new Garmin Fishfinder/Chartplotter 7" w/transducer.
If you are looking for a very good gps with detailed Winnipesaukee map, I did the research and this is what I purchased:
Garmin Echomap Chirp Plus 73cv Us LakevÜ W/Cv22hw-Tm Transducer
for $399 shipped!
http://www.hodgesmarine.com/
Nick from NE Marine can install - 207-266-1888
He comes highly recommended!