Seeking advice for a chartplotter for inland lake use. I would like at least a 5 inch screen. The odd thing I have noticed while shopping is that the GPS/Sonar combos are considerably cheaper than the standalone chartplotters. The Lowrance elite combo models are on sale now the 5 inch for $299 and the 7 inch for $449. Have read some comments about the Lowrance units intermittently shutting down and a restart brings them right back up. I like the Garmin echomap series from what I can find out about them. I am not interested in any type of networking. Unit would be on a flybridge with bimini top so internal antenna would be ok. Having sonar would not be a bad idea; the transducer selection is limited since I would need an in hull (shoot through) because there is no travel lift on my lake.