Looking at a Marcum LX-9 for winter use....all digital, with color camera also. Pretty salty.
May opt for the less expensive LX-7
"Forget pounds and ounces, I'm figuring displacement!"
If we accept that: MBG(+)FGSF(=)HBG(F1) And we surmise that: BG(>)HBG(F1) while GSF(<)HBG(F1) Would it hold true that: HBG(F1)(+)AM500(x)q.d.(=)1.5lbGRWT? PB answer: It depends.
I dropped 10K in electronics on my offshore boat in 2005. I installed both a Raymarine C series network and Garmin 3000 series networks. Ray system was 24 NM radar, GPS, Sonar. Garmin was XM sat. marine weather package overlay, GPS and sonar. Needless to say if I am going to be on the open seas I like 2 of nearly everything to make sure I can get back or not waste a trip. That being said I recently replaced the Garmin network and found I could now get everything I had a lot cheaper than back when the network was newer.
Oh yea I like that my raymarine sonar can read the bottom at 40+ mph. I have found several reefs while traveling open waters because it will pick it up.
Also I have friends using the chirp systems and I must say it is way beyond my Digital in definition of sonar readings.
I've got one of the little Humminbird 120 portable units. Down-looking and sidescan. It isn't fancy, but it is fully self contained and mounts nearly anywhere. A set of batteries lasts forever. For its versatility and price ($129) it is great in my canoe, kayak, paddleboat, and even on my dock. I still have an old neon-flasher unit from the 1960s that sits on a shelf in one of my sheds. Things sure have changed for the better.
The details are unbelievable now. Just got a new lowrance. We ran over an abandoned crab trap at 15 foot depth and I could see the details of the wire mesh. Unreal.