Thanks for the replies all - just had a search through handango and there appear to be some interesting apps (e6b comps etc), i think they ofter a trial period so will give them a go - re GPS products - is there an all in one program that lets you load aviation maps and swap to city directories? I notice that some pdas can be used as a car moving map with street directions... I think HP also have a new bluetooth GPS which may be good as it will allow you to keep a SD card in the device for extra storage.