I've got an iBlue receiver now but Maemo-mapper does not recognise it. I tried to pair it using the BT phone wizard, it is recognised as BT-Q800 GPS, I enter 0000 as passcode but then the message I get is: "Selected phone does not have services that can be used. Select another phone."

I have the BT application installed (for a BT keyboard), is that interfering with pairing?

....

Sorted. I had to use the BT plugin to connect which gave me the MAC address, which I entered manually in Maemo-mapper. (The MAC was set to 00:00:00:00:00:00 before as I did not have the receiver then.)