Replacement BT GPS receiver for navman 4470 needed

[robf]

Help! Scumbags nicked my Palm tungsten T2 and 4470 receiver from the car this week. I can get hold a replacement T2 or T3 easily enough, but need to know which reciever to get. Looking at the navman website it appears they don't seel the receiver separately so I need to know which one to buy to replace it with.
Any suggsestions?
I would prefer one which can run on regular AA or AAA batteries if possible. I don't need an external antenna in either car I am likely to use it in, and of course I don't want to pay too much either!
Thanks
Rob

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