Sperry Marine Visionmaster FT ECDIS User Manual page 274

Navigation Tools
Anchor Depth
The Anchor Depth is the water depth value at the Anchor Point.
The depth at the anchor point may be retrieved from the chart
soundings, when switched on in Chart Settings.
An anchor depth of between 1 and 100 metres may be entered when the
chain scope is set any value other than None. An alert is generated if a
sounding cannot be located within the distance from the anchorage to 10
percent of the current range scale.
Chain Length Scope
The chain length scope is a multiplier value used to calculate the chain
length. For example, if a scope of 6 is selected in a depth of 20 feet, the
chain length will be 120 feet.
The chain length scope may be one of the following values: None, 4, 5, 6 or
7.
Chain Length
The chain length is the distance from the hawsepipe to the anchor.
If a chain length scope has a value of 4, 5, 6, or 7, the system automatically
calculates the chain length as the product of the anchor depth and the
chain length scope. An anchor chain length may be entered from 1 and
1000 metres when the chain scope is set to None.
An alert is generated when the automatically calculated chain length is
greater than the configured maximum usable chain length.
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ECDIS User Guide
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