https://www.k0nr.com/wordpress/2013/05/3295/

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A Simple Wilderness Protocol: 146.52 MHz - The KØNR Radio Site

“The Wilderness Protocol” (ref. June 1996 QST, page 85), recommends that stations (fixed, portable or mobile) monitor the primary (and secondary if possible) frequency(s) every three hours starting at 7 AM local time, for five minutes (7:00-7:05 AM, 10:00-10:05 AM, etc.)  Additionally, stations that have sufficient power resources should monitor for five minutes starting at the top of every hour, Continue reading A Simple Wilderness Protocol: 146.52 MHz→

The KØNR Radio Site (www.k0nr.com)

this is cool! when i had an HT ham radio (and license) a long time ago, i had 146.52 MHz programmed in to listen while out on a couple trips, but i didn't know this was an actual thing