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How to integrate GPS to a portable device?

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?

Public Comments

1. With all the cheap GPS devices around why make your own? http://cheapgpsdevices.com/ ~ No, you don't need to pay anyone to use the GPS satellite signals Directions for making your own GPS receiver: http://www.gpsreview.net/homemade-gps-receiver-make-your-own-gps-receiver/