FLIR RAYMARINE A75 WiFi - Minimum Safe Beam; Minimum Safe Height

i.e.: Minimum Safe Depth = Maximum Vessel Draft
+ Safety Margin.
1. Waterline
2. Maximum Vessel Draft
3. Safety Margin
4. Minimum Safe Depth
Important: The information below is provided
for guidance only and is not exhaustive. Some
inuencing 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 can inuence how much a
vessel draws are shown below:
• Vessel displacement (weight) — A vessel’s draft
will increase when it is fully laden when compared
with its unladen displacement.
• Water type — A vessel’s draft will increase by
approximately 2% to 3% in fresh water compared
to seawater.
Some of the factors that should be taken into account
when calculating a Safety Margin are:
• Vessel maneuvering characteristics — A
vessel’s draft increases due to squat, trim, roll,
pitch and heave.
• Chart accuracy — The electronic chart depth
may not be accurate or the true depth may have
changed since the last survey.
• Weather conditions — High air pressure, and
prevailing wind strength and direction can affect
wave height.
Minimum safe beam
As part of the Initial startup wizard the Minimum
Safe Beam value can be set.
Minimum Safe Beam can be established by adding
together:
• Maximum Vessel Width (Beam)
• Safety Margin (an adequate clearance to either
side of the vessel.)
i.e.: Minimum Safe Beam = Port Safety Margin +
Beam + Starboard Safety Margin.
1. Port safety margin
2. Maximum Vessel Width (Beam)
3. Starboard safety margin
Important: The information below is provided
for guidance only and is not exhaustive. Some
inuencing 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.
Minimum safe height
As part of the Initial startup wizard the Minimum
Safe Height value can be set.
Minimum Safe Height can be established by adding
together:
• Maximum vessel height from waterline
• Safety Margin (an adequate clearance above the
vessel to account for tide and weather effects.)
i.e.: Minimum Safe Height = Maximum Vessel
Height + Safety Margin.
1. Safety Margin
2. Maximum height from waterline
3. Waterline
Getting started
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