Displaying And Interpreting Laylines - Raymarine LIGHTHOUSE 4 Operation Instructions Manual

Menu item and description
[(Fixed angle) Downwind angle ]
• Set the downwind angle for layline calculations.
[(Polar) Polar]
• Select the Polar table that will define your layline
calculation. Selecting a vessel's make and model that
most closely matches your own vessel will provide
better calculations and more accurate laylines to
follow when sailing.
• If your vessel's make and model are not
listed, submit the polar data for your vessel
to:polars@raymarine.com so it can be included in the
next software release.
[Display Layines on this chart]
• Display or hide laylines on the current Chart app
instance.
[Adjust for tides]
• Adjust the laylines to take into account tidal flow.
[Boat type]
• Set your vessel's boat type to provide more accurate
leeway calculation.
[Show wind shifts]
• Display the minimum and maximum waypoint laylines,
based on the varying True Wind Direction (TWD) over
the last specified period.
Chart app - Racing mode
Options Menu item and description
• 125° to 175°
[(Wind shifts) Time Period]
• 140° (default)
• Set the specified time period for wind shifts.
• List of
available Polar
tables
[(Wind shifts) Reset]
• Reset the recorded time of historical wind shifts back
to 0.
Related topics:
• p.178 — Navigate mode settings menus
• On
• p.194 — Racing mode settings menus
• Off

Displaying and interpreting laylines

• On
Once laylines are enabled and correctly configured in the [Laylines] tab in
• Off
the Chart app Settings, they will start rendering on the Chart display as your
vessel is underway.
• List of
available Boat
Laylines are displayed as a parallelogram under the following conditions:
types
• The vessel is under active navigation towards a [Waypoint] or [Goto].
• On
• A tack is required to meet an active [Waypoint] or [Goto].
• Off
• The direct distance to the destination point is less than 150 nm from your
vessel.
When the destination point is upwind the laylines will be displayed in a
parallelogram formation, with green and red laylines showing the port and
starboard tacks, as shown below:
Options
• 3 min
• 6 min (default)
• 12 min
• 30 min
• 60 min
• Reset
189