Shortwave Listening Logbook - 4MHz Band
| kHz | Station | Comments |
|---|
| 4023 | SAR Night | Search And Rescue. |
| 4125 | Marine Distress | International Calling. |
| 4138 | Arctic Seas Distress | With 4220 as Arctic Seas Supplementary. |
| 4146 | Marine Channel A | Primary simplex ship to ship frequency. |
| 4149 | Marine Channel B | Primary simplex ship to ship frequency. |
| 4625 | UVB 76 | Known as The Buzzer, the repeated droning tone is the subject of myth and legend worth a Google search. |
| 4651 | NAT J | Managed by Shanwick Radio and local ATC. |
| 4666 | NAT J | Managed by Shanwick Radio and local ATC. |
| 4675 | NAT D | 0100-0800 and 1100-1800 UTC. Bodo, Gander, Iceland, Shanwick and Arctic Radio. |
| 4684 | NAT J | Managed by Shanwick Radio and local ATC. |
| 4718 | UK Rescue Night | Search And Rescue. |
| 4724 | HFGCS | High Frequency Global Communications System. |
| 4840 | WWCR | Early morning evangelism from Nashville. |
