Editing Advance Wars (section)

===Sea units===

Sea units go on the water, as you'd expect. A lot of maps are based around islands, meaning that you need to build them to ship your units back and forth, but they're a very secondary consideration on non-island maps.

* '''Lander:''' Vulnerable but essential transport ships capable of carrying two units of any size at once.  An attacking army needs several of these, making killing or protecting these the prime directive for both sides. For some reason you can only stick two infantry units in one, but can stick two APCs loaded with two infantry units each (for a total of four) in one.
* '''Cruisers:''' These were an odd duck in the noblebright AW games, where they were a hard counter to submarines and flying units, but couldn't actually attack other ships. This made them very dependent on getting the first strike -- if they took a hit from a full-health bomber or sub, or a battleship took a potshot at them, they were toast. Then Days of Ruin gave them the ability to shoot other ships, and suddenly they're one of the best units in the game.  Weirdly enough, cruisers have always been able to carry and refuel helicopters, giving them a niche supporting role in a combined-arms sort of battle.
* '''Battleship:''' Naval siege engine with superb damage and the singular ability to move and fire at long range, dominantly powerful but require support.  Once you have a cruiser or two this is probably your prime naval unit. Days of Ruin cranked their price even higher but gave them the ability to move and attack, thoroughly breaking some maps.
* '''Submarine:''' Stealth-capable naval superiority unit with enough firepower to sink a lander or cripple a battlecruiser.  Can "submerge," as an action, using twice as much fuel but making themselves invisible to all but adjacent enemies.  And the only unit besides a cruiser capable of attacking a submerged submarine is another submerged submarine.  Fighting cruisers takes crafty and evasive tactics, and usually amounts to "don't".  Used carefully a submarine can recoup many times its own cost, as even one solid strike on a battleship will cost more than the sub.  If you can afford the expense, a hit squad of a few submarines and a scattered few cruisers and battleships can wipe out much larger and more expensive fleets.
* '''Carrier:''' Both DS and DoR feature aircraft carriers. They're quite different between the two games, but what they have in common are a huge price tag, monstrous power in the right hands, but relatively low defense and a dependence on other ships to protect them. In both games, planes can land on them for resupply. In DS, they pack an anti-air missile with a massively long range -- just as powerful as the Missile but much less susceptible to being flown over. In DoR, they're unarmed, but can build very nasty seaplanes to harass the enemy.
* '''Black Boat:''' A variant on the Lander which only appeared in DS. It can only carry infantry and mechs, but it can also repair adjacent naval units for 1HP. Unarmed, but dirt cheap, and good for spamming infantry in the early game on island maps.
* '''Gunboat:''' DoR's replacement for the Black Boat. They can carry one foot soldier and have a single salvo of transport-killing missiles. Good for infantry spam on island maps but die horribly to most other naval units.