Highfield Sport 300 Owner's Manual page 16

2. Stability and buoyancy
This boat has been assessed as capable of supported the weight of the crew, even in the event of flooding.
a) Fully laden displacement was used to evaluate the stability and buoyancy of the boat. The value of this
displacement can be found in paragraph "Specifications" as below.
b) Any changes in the distribution of loads onboard (for example by adding a raised structure for fishing, fitting
radar or in-mast furling, changing the engine etc.) can significantly affect the boat's stability, trim and its
performance.
c) It is important to keep water in the bilges to a minimum.
d) The boat's stability is affected by adding to the weight of the superstructure.
e) When under way, it is advisable to shut the hatches, lockers and doors to minimize the risk of flooding.
f) The boat's stability can be reduced when towing a boat or when using a davit or boom to lift a heavy load.
g) Air chambers shall not be punctured.
h) Breaking waves are a serious stability hazard.
Warning
Always adjust the speed and heading of your boat according to the sea conditions.
All of the watertight hatches and bilge drain plug must remain closed when at sea.