NEED SOME GUIDANCE HERE.TOTALY NEW TO THE GPS STUFF AND I COULD DO WITH SOME ADVICE.IM LOOKING TO BUY A GPS THAT WILL DO MY TRUCK AND BIKE.WHAT IM LOOKING FOR IS A GPS THAT CAN HOLD MAPS FOR UK AND MOST OF EUROPE RIGHT DOWN TO A-Z STANDARDS AS I USUALLY GET LOST IN TOWNS AND CITIES IN EUROPE WHICH AINT REALLY A PROBLEM ON THE BIKE BUT IT IS IN A 44 TON ARTIC 15FT HIGH.I KNO A LOT OF MEMORY IS REQUIRED FOR THAT SO IS IT POSSABLE TO HOLD DIFFERENT MAPS ON DIFFERENT MEMORY CARDS? ANY ADVICE ON WHICH GPS TO BUY AND ANY OTHER ADVICE IS VERY MUCH APPRECIATED.