Arrow IV Homing Missile
Arrow IV Homing Missiles are a variation of Arrow IV missiles first developed by the Terran Hegemony in 2600. The technology became Lostech during the Succession Wars and was first recovered by the Capellan Confederation in 3044. Designed to be used in conjunction with TAG, it was the artillery missile of choice for the Star League Defense Force due to the prevalence of ECM on the battlefield.
The Homing Missile is treated as a standard artillery attack, except it ignores to-hit rolls and only attacks units successfully hit by a TAG. If no target is tagged by the time the missile arrives, the missile will explode in mid air, harmlessly. This type of missile can't target a hex when fired immediately however, they are aimed at a map sheet instead. In rare cases, the missile can't "find" the map sheet (a roll of less than 4) and the missile is lost. In all other cases the player then rolls a pair of dice and, on a successful roll, deals full damage to the target unit as though it was a direct fire weapon, like an Autocannon and area-effect damage to all other units within the hex. This damage is rolled relative to the unit tagging the target, regardless of where the missile came from, so an Arrow fired "at" the front arc of a 'Mech, has a spotter tagging the rear arc of a 'Mech. The Arrow will hit the 'Mech in it's rear arc once it lands. An unsuccessful roll deals only area-effect damage to all units within the hex.
- Tactical Operations, pp. 353-354, "Arrow IV Homing Missile"