From the shďp section of the Bible:
Ships' target info picts are stored in PICT resources 3000 and on. The engine is
smart enough to reuse targeting picts for two ship classes that have the same
base sprites: all you have to do is give the first of any series of
identical-looking ship types a target pict in the usual way (PICT resource ID
3000 + shipID - 128) and the engine will use it for all higher-numbered ship
types with the same base sprites.
Hail is something similar; look at the existing resources to work out the exact formula. For example, if a ship with target pict 3020 has hail pict 6020, you add 3000 to the target pict to get the hail pict.
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"Insert witty quote here." - Thomas Castiglione