UTC Time Check
Before the days of GPS the frequencies were crawling with time hack stations. Most of those, alas, are gone. The frequencies 5000, 10000, 150000, and 25000 got you something almost everywhere in the world. These days those frequencies are pretty much just in the United States, but you might get lucky.
The National Institute of Standards and Technology (NIST) broadcasts on the following frequencies from the locations noted:
|2.5||40°40'52.2" N||105°02'31.3" W|
|5||40°40'42.1" N||105°02'24.9" W|
|10||40°40'47.8" N||105°02'25.1" W|
|15||40°40'45.0" N||105°02'24.5" W|
|20||40°40'53.1" N||105°02'28.5" W|
Through the Internet
Among many sites, there is: http://utctime.org/
Through the GPS
Photo: G450 MCDU Nav Ident page, from Eddie's aircraft.
UTC Time Check (http://utctime.org/)