POLAND_SPUD wrote:in most situations your target won't be 10 or 20 meters away but up to 100 meters or more
Whether or not you can ID a pirate attack (and presumably start shooting) at 100 m, is largely irrelevant. What IS relevant, is that to get aboard your ship, they DO have to be within 10 or 20 meters.
Basically the pirates are climbing aboard at the fantail. OK, so how far off the water is the fantail? MAYBE 20 feet? Voila... You're basically guarenteed that the bad guys will have to be within 20 feet of a very specific part of the ship.
Suddenly 10-20 meters is totally doable. You'd likely want to harden your location, but that's easy. Point is don't expose yourself or let them know you plan on shooting back until you see the proverbial whites of their eyes. And then put a hole in the bottom of their boat.