This morning, CG49428, a 49' buoy tender out of Curtis Bay, is transmitting AIS while operating in the Severn River. And correcting my previous entry, USCGC Sledge is a 75' construction tender. Since these vessels are tenders rather than patrol vessels, they will have black hulls, vs. the white hulls normally seen on larger patrol vessels.
Later this morning on AIS, CG25585, a 25' Defender class patrol boat, is working in the Patapsco River - going pretty fast at 38 knts.