"Under the contract, SRI will install radar that can track vessels almost anywhere in Tampa Bay and to the end of the channel...
A separate radar will watch for low-flying aircraft around the port. SRI also plans to use underwater sonar to scan the hulls of cruise ships and miles of seawalls. Sensors placed below the surface will detect toxic substances in the water.
The system looks for "anomalies,"...That could be an inflatable
boat speeding toward a cruise ship or a freighter that appears on radar
but has turned off its radio transponder."
St. Petersburg Times