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The GPS and radio were wired at the dealer so they are probably on the ACC circuit.

There is no fuse box. Each switch has the fuse below it. Push the button under the switch marked ACC or remove the cover and replace the fuse.

If that does not do it...

Trace the wires for the GPS/Chartplotter and see where it ties in to power. There should be either a) inline fuses or b) a circuit breaker that is like a button that you push to reset. The breaker is usually on a black plastic cover.

Take a look at:

bus bar connections - see
http://bostonwhaler.com.s3.amazonaws....2-2001.pdf

If you are still stuck, take photos of inside the console so we can see what you have.