Assuming that your fishing, I would get the kick a$$ fishfinder then a decent Chartplotter and radio. Out of the three, the radio is the easiest, most current radios are DSC/Ememergency today and you can get a decent radio for $200 or so (unless you're going way offshore), just be certain to get a good antenna - a cheap antenna will waste a decent radio... Backup the radio with a used job stashed away somewhere and backup the chartplotter with a handheld GPS.
Get a good color fishfinder, with or without chart capability and then get a decent chartplotter system with WAAS and some interface system to PC.
I doubt a laptop would be wise on a CC, certainly not in the electronics box. They fail too easily under normal use, pounding away in the electronics box might be too much.
I've been toying with a seperate idea by building a small desktop under the console. There are some solutions available now that allow sealed and fanless operation of a desktop that may allow a unit smaller than micro ATX to be stashed in the console - then you would be able to hook up directly to your electronics on the fly and do real-time manipulation and commentary of your data. The biggest issue at this time is screen - I should be able to build a cable that I can use older laptop LCD screens... Again just toying with the idea at this time. The only question I have is on the screens...
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