thanks Griffdowg the mud is starting to clear.
Although Maplins just told me there dongle GPS wont work with memory map, i thought it was just a signal not a programe
maybe they were thinking of the hand helds. MM produce a number of small and hand held units (I have an adventurer 2800). It should work, redhand uses it and I use a Garmin GPS10 so a 3rd party signal is not a problem