In a ship - whether surface or submarine - a 'ladder' is what a landlubber
would think of as - and probably call - a 'stairway' or 'staircase'.
Generally, though perhaps not on passenger ships in the passenger area,
they are steeper than 'normal' stairs. Thus, my question:

A "regular" stairway is likely to have a "pitch" of anywhere from 1:2 to
1:1 - that is, a rise of one unit to a tread depth of two units at one
extreme, or a rise of one unit to a tread depth of one unit. (In practice,
"one unit" is ~20-30 cm).

Some ships' ladders are vertical, and attached to the wall. This is most
likely to be done where space is at the utmost premium. Where the space
constraints are not so tight, the ladder may be angled. The question is...
what's the typical pitch of such angled ladders?

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