I just used google and do see a Rescue 21 site there (DF andVHF antennas seen on Google Streetview). Note that that web page says manned which most Resuce 21 sites that I know are not.
Yes, each Sector can take over if needed for the other, but for RDF (Radio Direction Finding) it is also helpful to have access to the adjacent towers for overlap
Yes, some only just recently (past 2 yrs) began to appear re-named as VTS, each any everyone in my area has been matched to a Rescue 21 site
Even those without heavy traffic, others are just the MMSI
Bristol Maine
at 43.91636298309788, -69.484920501709
I just used google and do see a Rescue 21 site there (DF andVHF antennas seen on Google Streetview). Note that that web page says manned which most Resuce 21 sites that I know are not.
Yes, I seen Rescue 21 operating a my local Sector.
When a radio transmits you see the area in which it is located on the map display. Also see lines of positions coming from site locations displayed on map display