ARINC HF Coverage Areas and Frequencies
Customs Over-The-Horizon Enforcement Network (COTHEN) Updated 4/6/2011
HF Global Communications System (HFGCS)
US Coast Guard HF System
FACSFAC HF Freqs (Navy)
Link 11 Voice Net (Navy)
NASA HF Freqs (helpful during Shuttle & Rocket launches)
HF World Air Route Areas & Frequencies