Was browsing the legend for low altitude IFR charts and I wondered why they still included brown for LF/MF airways. Wikipedia reports the four-course radio ranges were allegedly decommissioned by the 1970s. Well according to this site the notation is still used for some NDB routes in Alaska and one in North Carolina:
https://www.boldmethod.com/blog/lists/2024/12/10-types-of-ifr-routes-on-enroute-charts/
Except I no longer see North Carolina's G13 on the latest chart. (The article was published 12/12/24, so fairly recently removed.) That leaves Alaska - and unless I'm missing something in the interior of the state, the only ones I could see were between NDBs installed on islands in the Aleutian archipelago and west of Nome.
https://www.boldmethod.com/blog/lists/2024/12/10-types-of-ifr-routes-on-enroute-charts/
Except I no longer see North Carolina's G13 on the latest chart. (The article was published 12/12/24, so fairly recently removed.) That leaves Alaska - and unless I'm missing something in the interior of the state, the only ones I could see were between NDBs installed on islands in the Aleutian archipelago and west of Nome.