Table of Offsets

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Table of Offsets

A table of offsets is a chart of measurements which, when read in conjection with the lines plan and offsets drawing, describe a vessels hull form. The chart contains heights above baseline, half-breadths, and diagonals at each station.

Contents

Traditional Stations

Stations are labelled from 1 to 10, with 0 being the AP and 10 being the FP. Half-stations may be added in areas of notable curvature, to give a better definition of the lines. The stations are evenly spaced, Being referenced between the perpendiculars. As such, they don't necessarily align to frame spaces.

Modern Stations

The advent of computerized hull modelling software makes it easy to define a large number of stations. Rather than running from the AP to the FP, the stations can be placed arbitrarily. They are referenced to a common datum; i.e., midships or the AP. These stations will then be labelled as such; i.e., -500, AP, 500, 1000, etc.

Heights Above Baseline

Distances above the baseline are given for the intersection of buttocks lines and the station spacing.

Half Breadths

Distances from the centreline are given for the intersection of waterlines and the station spacing.

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