Minimum safe width calculation guidance

The information below is provided for guidance only and is not exhaustive. Some influencing factors can be unique to certain vessels and / or areas of water and may not be listed below. You should ensure you account for ALL factors that apply to your current situation when making calculations.

Some of the factors that should be taken into account when calculating a Safety Margin are:

• Vessel maneuvering characteristics — A vessel’s required clearance will increase due to roll.

• Chart accuracy — The electronic chart data may not be accurate or may have changed since last surveyed.