It was with a freighter, China to Panama bound - no one on watch - about a quarter of the way across to Hawaii. My boat was so small it was mostly invisible to radar - I spotted it on the horizon, but it appeared to be on a parallel course so I wasn't too worried - I went back to sleep and was woken by engines. After crash gybing out of the way, I radioed the vessel many times, with no response. Out of paranoia I then did the rest of the leg with a strobe on - my next encounter was a vessel that had stopped because it thought I was in distress...