Does that mean,An area reserved for worshipping the Icons, with eight visible Icons, and an asymmetry in their placement (or an empty alcove) for the Faceless One. Grants a +1 to the prayer reroll for the entire crew (page 55), as well as a bonus to portal jumps (page 139).
a) The crew of a ship with a chapel will always re-roll with one additional die?
OR
b) The crew of a ship with a chapel will re-roll with one additional die while on board the ship?
OR
c) If you pray in the ship's chapel you get a +1 bonus to re-rolls associated to the Icon you prayed to (which would make this basically as effective as praying without chapel, so I guess not)?
OR
d) If you pray in the ship's chapel, you get a +2 bonus to re-rolls associated to the Icon you prayed to, i. e. it's a convoluted way to say it counts as a chapel for praying?