New toy from China:
On boot it runs at about .45A climbing to a stable .65A.
Dongle only cost a fiver mind you.
Those are great for a rough guide, especially given the price. I have a couple of other types and they very handy.
They can, however, mask what is really going on. PilotAware doesn't draw a steady state, the consumption constantly varies as it works, this screen shot is about 5 seconds worth of power consumption to give an insight into what is going on.