a. Know your position at all times;
b. Make sure you know the conditions around you at all times;
c. Keep your maritime mobile radio system on;
d. Oh yes... and if you're planning on being anywhere around the Horn of Africa you might want to check in with the EU Maritime Liaison Office to find out more about pirates and the International Recommended Transit Corridor (IRTC).
Apparently, not all yachtsmen have the brains to manage more than one thing at a time.
The commanding officer of the Netherlands frigate Hr Ms Tromp, on patrol off the Horn of Africa, reports this on his Twitter account from 26 Feb, 2010.
Encountered a small sailing yacht in the IRTC, when queried it stated “what do you mean piracy?” welcome to the real world.