Re: chart ploter advice
I Don't own the unit, but have been considering it. I've been eying them up since they were 1st introduced. To my knowledge the initial model did not allow radar overlay...the newer models do. Whether or not this is just a simple software update or not, you'd have to check with Garmin, if the overlay is something that you want.
From the demos that I have seen, it's pretty fast, very viewable and easy to use.