[疑難] 請問如何用PDA使用GPS?

i asked the shop in golden.. the sales told me that if my phone doesnt have a gps.. then i just have to spend like 600-800.. to buy a external gps thing... it is a bit bigger than a match box.. then i have to buy or look for the map from internet... download it and have it install it into the pda or phone... then look for a place where has less buliding blocking.. to do the 定位... but i havent tried.. coz some of my friends said it is not very useful here in hk.. coz there are too many buildings here... they said it is very useful in beijing.. when theygo travelling.....hope this info can help you.....good luck