Not sure about the name and shame policies here, so if naming is okay, I'll provide the Clan name on a later posting.
On PvP 2 U.S. server players have been using mission battles to hide a larger force to attack players. What they are doing is creating a group of 5 to 6 players, and obtaining missions from a friendly port that is located near enemy ports. These missions can be the lowest ranked mission available, the quicker to finish the better. Hoping of course that their mission is located near an enemy port or along a major trade route. They all go into the mission battle and after the allowed time, the cross cutlass disappears and they complete the mission. Though once completed they remain in the battle area, I have never remained after the battle to see if there is a timer that kicks you out. So on this, I'm unsure as to how long they remain HIDDEN, because while they are in the battle and the cutlass is gone, they're location or number of ships are hidden from the OPEN WORLD.
One player exits out of battle and becomes bait or hunts enemy ships, of course this is being done near their mission battle area. An enemy player sails up on the player who sits waiting, and of course, the player is now targeted or the exiting player targets them, either way a battle begins in 20 seconds. At first the battle appears to be a 1 vs. 1 battle. Once the battle starts, the remaining players still HIDDEN from view in the completed mission battle exit, waits for their invulnerable cool down and enter the battle. So they're using the in-game battle mechanics to stay hidden from view. Not sure if this is playing within the rules or not. But what good is scanning the horizon when sailing in the Open World if players can hide within the game and pounce on unsuspecting players.
The Clan bragged about how they could remain hidden after doing this tactic. Being sunk 5 vs 1, even 10 vs 3 is not an issue and fairly common; we all get sunk from time to time. But being able to obtain these numbers by being hidden in open waters, is not a fair engagement. Its bad enough, this Clan is part of one largest populated nations as it is, but to hide their numbers, when they already have a large player base, goes a bit to far.