11
Vessel Operation
This is done in case you need to adjust one later so the
line is accessible. If two anchors are used ahead of a boat,
make sure to set the rodes at an angle than in a straight
line to reduce the chances of tangeling as the boat moves
in wind and current. See the above illustration.
USE THE ANCHOR SAFETY HOOK TO HOLD
THE ANCHOR SHOULD THE WINDLASS FAIL.
DO NOT USE THE SAFETY HOOK
AS THE SOLE HOLD-DOWN SUPPORT
FOR THE ANCHOR.
To anchor safely and correctly requires the use of RODE
and SCOPE terminology. The rode is the line that connects
the anchor to the boat. The scope is the ratio of the rode
length to the distance vertically from the sea bottom to
the bow.
A formula that may help you determine rode length is:
Scope= Rode Length
Bow Height + Water Depth
Rode Length=Bow Height + Water Depth x Scope
Determining factors with Scope are type of anchor, wind
and sea conditions, tide and type of bottom.
Minimum is 5:1 for calm conditions, average is 7:1 and
severe weather conditions require 10:1.
An example of the formula is as follows:
Rode Length=(5 feet + 20 feet), x 7
Rode Length= 25 feet x 7
Rode Length=150 feet
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