USCGC Hamilton with its EOSS (Electro Optic Sensor System) atop its bridge. 

The Drive/The War Zone has a post regarding the Mk20 Mod1 Electro Optic Sensor System (EOSS) that is equipping National Security Cutters and Offshore Patrol Cutters in addition to the Navy’s newest destroyers and the new FFG. The post is in the form of an interview with a company rep.

We have talked about this system before here.

For such an inconspicuous system, it looks to be extremely useful. Other than using it as a firecontrol for ASuW and AAW, this system can be used for:

• Location and tracking a man overboard
• Channel position and navigation
• Detection and identification including looking for the IR signature of low profile vessels
• Naval gunfire support
• Safety check-sight
• Battle Damage Assessment

These will definitely be used on the Offshore Patrol Cutter. The earlier Mk20 Mod0 version was in the Draft Technical Package back in 2012.