In April I bought a Lowrance combo GPS chartplotter
/ SONAR unit (LMS337 C DF). This has a 5" high resolution (480 X 480) color screen, 50 and 200 hz SONAR transducer, external GPS
antenna, NMEA 2000 (and 0183), etc.
The unit was easy to install and works great. I paid $550 at Westmarine (closeout price) with a 3 year service plan. For $100 I bought the detailed charts
for the entire US.
The only difficulty is that the connectors for the SONAR are very large so I could not fit the wires in the steering pedestal or the pedestal guard. I have bought a bigger pedestal guard and will do a better installation job over the winter.