I use an Ipaq 5455 with a Navman sleeve at present (soon to be updated). I use a program called Pocketfms and if I need an OS map I can download from Fugawi which gives OS coverage of the UK. Memorymap also do the CAA 1:250000 and 1:500000 charts which can be loaded on as well.
Then into the car and Tomtom shows me the way
