OS landranger maps on a PDA ? easy just buy memory map then you will have the most detailed maps you are likely to need, because i am bluetooth GPS I don't have the jacket but I think it will work without problems, remember as the maps are really detailed you will need a decent sized memory card ie 2 areas of mm plus the road map will nearly fill 256mb
C7KEN 4150 ipaq with 4400 bluetooth navman very happy