OTish Palm, Pocket PC Thingy for Dive Planning.

Morning all.

Apparently the Christmas season is upon us (mumble bah humbug etc) and
I am being asked what I would like.

Quite fancy some kind of hand held computer thingy which I could use
on a boat for dive planning (acc. deco).

Whilst I'm at it, would be nice if same toy could also be used for (on
road) sat nav.


Better still if I could hook it up via a bluetooth mobile to the
interweb.

I'm sure I've also seen someone displaying admiralty charts on a
handheld, so that would be a nice to have.

So, what sort of electronic thingumy should I be looking at please?

David