The UK Hydrographic Office www.ukho.gov.uk/ has published Chart Q6099 covering the Red Sea, Horn of Africa, and Persian Gulf. This chart can be used for planning the passage through that principle piracy area. It has the recommended passage routes marked and information on how and whom to contact to both inform of your transit and call for assistance.
This should be a great help to the OOW as everything will be in one place for route planning, navigation, transit contact points and information for calling in the event of an attack.
The United Kingdom Hydrographic Office website can be found in the Link List below and an electronic copy of Chart Q6099 can be downloaded from UKHO.