higgs, try this....
it's a forward-looking sonar with a claimed range of 1000 feet. It finds fish, so a shipping container shouldn't be much of a challenge.This would give you about 2 minutes warning - the description doesn't mention any alarm, so you'd have to keep a pretty good eye on the screen - plenty of time to evade.If it had an alarm that could be hooked up to the autopilot, even better.I've always wondered just how many shipping containers are actually floating around out there. Even if you DO encounter one, it seems like you'd have to hit it pretty much at right angles to seriously damage your boat.My fantasy: I'm sailing to Hawaii, and 5 miles from the harbor, I encounter a container. I take it in tow, which (I think) gives me salvage rights, bring it to the harbor, open it and find it full of 80" plasma TVs, all in perfect condition. Meet me on eBay, I'll give you a good deal.

Cheers,Bobs/v X SAIL R 8