Missing TAC tower?

I only just started using the GUI & API to find the tower location to which a ship I monitor is connected (via a Peplink unit). The first test, the ship was reporting:

MCC=302
MNC=610
LAC=45006
Cell ID=44777

The tower popped up perfectly. Great!

Checking today, the ship is reporting the tower as:

MCC=302
MNC=610
TAC=11501
Cell ID=41769

But this gives no match in the database. Do I need to do something different with TAC reporting, or did I just happen to hit a tower that is not mapped?

Thanks,

Allan.

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