[Lowfer] Navtex QRM 518 kHz

[Garry Hess]

No one else has commented on the interferer J.B. and I copy on the 518 
kHz Navtex mark frequency (-shift/2). Tonight it's coming in at -66 dBm 
on my SpectraVue waterfall, compared to -90 dBm for $04N, Chesapeake, 
Virginia. This makes decoding impossible. Since J.B. and I are over 300 
miles apart, it would seem this interference is widespread and hindering 
maritime users. So it should be reported to responsible authorities, but 
just who are they? Does any one know? The US Coast Guard site at 
http://www.navcen.uscg.gov/?pageName=NAVTEX lists links for reporting 
problems with GPS, DGPS, etc. but I don't see anything for Navtex. 
URL=http://www.nws.noaa.gov/om/marine/navtex.htm indicates reception (or 
lack of) reports can be sent to marine.weather at noaa.gov but that doesn't 
seem sufficiently urgent.

73, Garry, K3SIW, EN52ta, Elgin, IL