12.1.2 Consideration
may be given to a specification agreed by the Shipbuilder and Owner
for a given specific trading route, based on the environmental conditions
for the intended operation, e.g. temperatures and sea states, and
any operational considerations, e.g. specific ship arrangements.
12.1.3 For ships where alternative designs are to be applied, the Winterisation
D(t) notation may be assigned. The external design air temperature is
to be included in the Winterisation notation in brackets, e.g. Winterisation
D(-25).
12.1.4 The design air temperature is to be stated in association with the external
design air temperature in degrees Celsius for the assessment of hull construction, and
equipment and systems where applicable.