Since posting about the US Coast Guard utilizing more federal interoperability frequencies, I have run into some changes in my own listening area in Portland, Oregon.
Until recently, the CG tended to operate on either the standard VHF marine channels allocated for Coast Guard use. They also had access to, and used often, a talk-group on the Portland metro area 800 MHz public safety trunked system. However, around the time of the Portland Rose Festival, most of the activity on these channels seemed to disappear.
While searching around, I discovered that they had moved to one of the new CG "NET" channels in the APCO P-25 mode. So far SECTOR PORTLAND is using NET 21 (165.3125 MHz) in P25. It does not seem to be a repeater, but the base transmitters are probably located at one of the new Rescue 21 antenna sites in the area. Also, while the US and Canada had some navy vessels docked at Portland's Waterfront Park for the Rose Festival, CG security PACCOMM was heard using 163.1375 MHz, NET 113.
http://www.uscg.mil/d13/sectPortland/default.asp
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