The bad news is these things are relatively pricey. Figure about $600
for a Class I without GPS, and about $900 with GPS

That is not expensive at all. When you buy a car, the dealer wants around this
price if you want the good stock radio. When buying a car, this ad on price
is nothing. When people have enough money to buy boats, this ad on price for
the accessory is even less of a big deal.