Definition(s)
Vertical Ladder
Vertical ladder means a ladder of which the inclined angle is 70º and over up to 90º. A vertical ladder shall not be skewed by more than 2º.
Source: IMO Resolution MSC.158(78), amendments to the Technical provisions for means of access for inspections (Resolution MSC.133(76)), 20 May 2004, International Maritime Organization. Regulatory Guidance