I was going to suggest the same thing. My present boat
has the Furuno
GPS you have as a backup to my Raymarine
E80 chartplotter. Although the 'all bells and whistles' E80 is FAR better in very way than the simple Furuno unit, I still have BOTH on when I take her out. I find the big clear LCD display on the Furuno easier to see the simple things like course and speed.
Now, if youve got a laptop, then don't bother with expensive chartplotters if youre on a budget
. I too have bought a 'mouse type' GPS reciever, this time for £20 inc delivery
from Ebay. Combine that with any laptop, the FREE OpenCPN
plotter software (full details available on this forum) and bingo, you have a pretty damn good colour chartplotter with a nice big screen!
The only disadvantage I can see is that you'll need to keep it below as most lappys don't like salt
spray much, but most sailing yachts i've seen have their specialist marine
chartplotters mounted below anyway.