<http://www.navcen.uscg.gov/pdf/lnms/LNM_Special_Notice_2012_2182kHz.pdf> The US Coast Guard issued a special notice stating that, due to the aging Coast Guard Medium Frequency radio infrastructure, calls to the Coast Guard on the international radiotelephone distress frequency 2182 kHz may not be reliably received by the Coast Guard. Mariners who hear distress calls that has not been acknowledged by the Coast Guard are asked to assist by advising the Coast Guard unit by using whatever means are available. (3/21/12).