I have decided against removing the AM/FM/Cassette stereo from my boat and
will instead buy a 6GB Ipod Nano with an attachment to play it over the
stereo.

My son and daughter both use those radio signal attachments (wireless) and
say they sometimes lose signal strength. The other option for me is to play
it through the cassette player.

I can buy a hard wire connection for it but I don't want to spend $150 for
it.

Does anyone here have any experience with the different types of methods to
play through the car/boat stereo and if so what is your recommendation?

I did that on my boat...daughter's ipod broke so I bought her a new one
and fixed the old one...then bought a battery powered FM transmitter
(belkin?) at walmart for about $30 and it does good, and I have a 38'
sportfisher...