I have a problem with that... it's nothing more or less like a super-radar that will tell you enemy presence for all purposes, not just landing your GV. That would help you to know about enemy GVs long before they can be seen or even heard. It makes ambushing enemy attackers quite difficult "Wait - there is someone near the town, my light on the dash just went on - There must be someone near town, don't move the m3 forward yet"
also, im going to add to this, but one day i spawned into a base in my t34-85 and reaked havok on that base, and got 20 kills(of tigers, panzers, m4s and other t34's), but the base i spawned from was captured 30secs before i landed back at the spawn. now there was nothing out there because i had air cover and they didnt see anything and i had killed all the gvs that had chased me. but when i "landed", i got a ditch. and to top it off i still ended up loosing perk points (which is BS!).
i didnt say it was this tour, it was last i believe or maybe it was may's... i have only been on 2 days this whole month because i had stuff to be done in RW