the USCG Nets are P25 conventional
there maybe some Analog uses that the USCG still has in play but those would not the the UHF and VHF Nets as listed in the RRDB and Wiki
The VHF Marine (are not USCG) and are Analog
The USCG Aux is Analog
exactly what frequencies/tones are you seeing as a mixed bag ??
OK - thought they had implemented a different Freq for the NW as 150.7000 was not available up there (Portland Specifically)
I remember seeing something about 143.4750 R / 149.2000 in the early 2008/2010 range and I thought someone confirmed this one in 2015.
North Bend on 150.7000 I've not seen reported for the PL
Seattle on 150.7000 was only known thru the NTIA FOIA but it used 149.5375 input, same for the Bellingham Repeater