NOAA installs PORTS navigation system in Boston Harbor

The Tobin Memorial Bridge, seen in 2009, spans the Mystic River in Boston Harbor. A newly installed NOAA Physical Oceanographic Real-Time System (PORTS) includes an air gap sensor on the bridge to provide mariners with real-time vertical clearance data as tides shift throughout the day.

The Tobin Memorial Bridge, seen in 2009, spans the Mystic River in Boston Harbor. A newly installed

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