Use "A" and "D" keys to move the battle ship. Use mouse cursor to Aim at Enemy Helicopters. Use left mouse click to shoot the helicopters. Use "S" key to Bomb Underwater Submarines.
Collect green balloons falling from the sky to recharge your ammunition to shoot submarines.
When Ubisoft showed off Ghost Recon Advanced Warfighter earlier this month, we weren't allowed to talk about the multiplayer section of the game at that time. Now we can, and Ubisoft and its Red Storm studio (which is developing the multiplayer section) have clearly thought about what players liked about the original GRAW's multiplayer, because they have built upon it considerably.