Airplane mode on (no cellular or wifi network radios on at all) and enabled GPS alone, seems to be fine. Picked up 8 sats eventually and got a fix.
Took a couple of minutes but that's whilst indoors too, where it isn't really designed to work anyway. Would probably still take about a minute or more from cold anyway without assisted. Seems to be working prefectly normally.
I used the 'GPS Test' app; obviously if you want GPS on maps then you need some kind of offline map cache or app, the google maps will want network connectivity to pull down the map data itself.