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The Russian cannon-fodder invading Ukraine were so ill-equipped they were using their own phones and roaming on the Ukranian network to call their commanders. They were easily triangulated...

https://www.bbc.com/news/technology-42853072

Ships are fairly obvious to spot, land bases are a different scenario.

Seems like a really easy way to triangulate the location of ships.

In today's sensor rich environment of satellites, aircraft etc, a carrier's location is never a secret to an adversary. Ever.