I’m not entirely sure what the geoscope does, so I can’t speculate too much about what role it could play, but something kept in the Men of Letters bunker would ideally work in Team Free Will 2.0’s favor.
If so, it could come in handy in the battle against God, which of course also now includes a battle against Amara since one dying and the other living would throw everything out of balance.
An interdimensional geoscope is definitely not something that Dean has been transporting in the back of Baby for the past decade and a half, and it sounds to me like it has cosmic connections.