I have long felt the Coast Guard should be a partner in a Maritime Domain Awareness (MDA) program along with the Navy. AMVER is really a sort of MDA, but includes only those that want to be included. It could be an input to a more complete system.
I was surprised to find that DOT already maintains, SeaVision, an unclassified MDA system in partnership with US Fleet Forces Command, Naval Information Warfare System Pacific, and Battlespace Awareness and Information Operations (PMW120) (the SeaVision Team). The Coast Guard is notably absent though I have to believe the Coast Guard is providing information.
Reportedly SeaVision has over 5,000 active users from 120 partner nations.
Below are screen grabs of its claimed features and data.






