all in one units seem like a good idea if you dont have the room for separate units . but i like having seperate units just in case something goes out .if your combo gps,sounder goes you are left with nothing but your paper chart and your compass.also unless you buy a huge screen splitting the screen to show both can get crammed.ive had great luck with my small garmin chartplotter and lowrance fishfinder both are color and reliable. i also found room on my console for a stand alone radar unit. unless i have a complete electrical failure, i should never be witout some sort of navigational help.i have everythig on seperate breakers and double prtected with in line fuses.you will probably spend a fortune and drive yourself nuts deciding what to get, but always remember,your electronics are for safety first,fishing second and you can never be too safe on the water! good luck!
