Between GPS, compass heading and accelerometer, which consumes the most amount of battery?

Question

Does anyone know between GPS, compass heading and accelerometer which uses the most amount of battery (or how they compare relatively?)

I'm assuming somewhat naively it's:

accelerometer < compass heading < GPS

but I can't find anything to substantiate or refute my intuitions.

Clarification: I'm curious as to how it performs specifically on an iPhone.

Answer 1

Well it really depends on the device. A GPS with an active antenna will consume the most power. Accelerometers and compass usually only draw milliamps when running. Generally your order is correct.

Specifically to the iPhone

1. GPS: 4mA (Assuming it runs on 3.3V. I cannot find the datasheet)
2. Compass: 1.2mA
3. Accelerometer: 0.25mA