47 C.F.R. § 95.1401 Frequency.
Title 47 - Telecommunication
The frequency band 406.0–406.1 MHz is an emergency and distress frequency band available for use by Personal Locator Beacons (PLBs). Personal Locator Beacons that transmit on the frequency band 406.0–406.1 MHz must use G1D emission. Use of these frequencies must be limited to transmission of distress and safety communications.
Title 47: Telecommunication
PART 95—PERSONAL RADIO SERVICES
Subpart K—Personal Locator Beacons (PLB).
§ 95.1401 Frequency.
