I have a Garmin GPS III hand-held which is fantastic despite being a bit out of date. Make sure you get one with a built-in map. You get what you pay for with these. I find it brilliant. If I need to get to a meeting somewhere unfamiliar, I enter the postcode in the ordance survey site. This gives me the grid ref which I stick in the GPS and it points the way. Also good if you go exploring a city or in the countryside (the what?) - it will help you find your way back to the car or hotel.