sh asked: If I need to make a portable device which you can carry around with you to give the exact location, altitude, climb and descent.
What electronic chips hardware will i need to make a portable GPS system?
Is there a need to make a payment to some company to use GPS?
go on wikipedia
easiest to just buy a chipset or module from one of the major GPS OEMs. try garmin, magellan, SiRF and similar mfrs.