Many thanks to Craig Fuller who shared this excellent Aeronautical HF radio map on the Shortwave Listeners Global Facebook page.

Click here or here to download the map as a large graphic.

Note that this map is 13 years old and somewhat out-of-date.  Paul Jones kindly posted some frequency updates to the Shortwave Listeners Global Facebook page:

Confirmed SHANWICK QRG’s.
(Shanwick = Shannon/Prestwick)
Clearance Delivery
123.950Mhz
127.650Mhz
135.525Mhz

Southern Routes
3016 HF
5598 HF
8906 HF
13306 HF
17946 HF

Family ‘B’Central & Northern Routes
2899 HF
5616 HF
8864 HF
11279 HF
13291 HF
17946 HF

Family ‘C’ Central & Northern Routes
2872 HF
5649 HF
8879 HF
11336 HF
13306 HF
17946 HF

Family ‘D’ Central & Northern Routes
2971 HF
4675 HF
8891 HF
11279 HF
13291 HF
17946 HF

Family ‘F’ Central & Northern Routes
3476 HF
6622 HF
8831 HF
13291 HF
17946 HF

Shanwick VHF 127.900 Mhz

EMERGENCY 121.500 MHz