Well I am Norwegian; just happen to live in the US for a couple of years. It must be my excellent languageskills that made you think of me as an American
I am not a knight of the magenta lines/arrows so I do not know what the NAV RAD page does... but taking the IFR charts into account, there are still a lot of NDBs around in the US... It seems like those NDBs are servicing the small airports, and my impression is that they serve the small,
old, airports.
New, small airports seem to get the GPS-approaches and/or a VOR/DME approach based on a VOR/DME waaaaay off the field* (nothing wrong with that) instead of setting up a stoneage NDB at the field. The old small airports seem to be getting the GPS-approaches as well, ready to decommission their NDB at the next breakdown or when the NDBs are withdrawn nationwide (whichever occurs first)
*
like this one: http://204.108.4.16/d-tpp/1004/05537VDA.PDF - SGR also has an ILS and two GPS approaches