I can't find any information about CTANS

Hello all,
I’m reading though the 5th edition of Ship handling for the Mariner, and it mentions this system called CTAN that I’ve never heard of, can’t find anything on google, and I can’t find anyone else who has heard of it.

Graphic presentations on a laptop used in two way based DGPS systems, such as the Panama Canal Innovative Communication tracking and Navigation (CTAN) system, are just as much a communication as spoken messages.

Is this a fancy, old term for like an ECDIS or ECS? I’ve never heard anything called an interactive DGPS system. The 5 edition is from 2018, so ECDIS was defiantly a thing. Can anyone point me in the right direction?

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