Close enough for a quick reply, but it's not the "radio" using lots of power, it's the chip that's doing the signal processing. GPS signals are very weak (appro

Close enough for a quick reply, but it's not the "radio" using lots of power, it's the chip that's doing the signal processing. GPS signals are very weak (approximately -120dbm) and thus below the noise floor. It takes complex FFT operations that actually cause the power hungry nature to find the proverbial needle in the haystack.