[MarHoff]

At the time of the location gate I had parsed my personal buffer and I found out that pretty much all Manhattan was included. I hadn't a roaming plan when visiting New-York so I only got randomly access to internet at free hotspots.

So I guess a good rule of thumb would be to turn off while on the road with no wifi, but keep on in cities (where A-GPS is the most efficient) where you gonna stay for awhile with sporadic hotspot access.

Also classical GPS (while slow to kick-in) is often really good enough in countryside where you don't suffer from building shapes interfering with the signal.