MaxSea Operator Manual version 12.6 - Furuno USA

MaxSea Operator Manual version 12.6
Efficiency values
The Efficiency Values indicate the boat’s potential speed in accordance with the running polar.
The efficiency measured as a percentage is equal to the theoretic speed of the boat, as suggested by the running polar
(dependent on the wind force and the ship’s course), and with the actual current wind bearing taken into account.
Efficiency on VMG is equal to the value of the theoretic VMG of the running polar (dependent on the wind force).
416
Note: the program automatically chooses to work on the close hauled VMG or before the wind, according to the
real measured wind bearing (close hauled for a real wind bearing below 90°, before the wind for a real
wind bearing above 90°).
Efficiency on Waypoint is equivalent to the current speed towards the mark in comparison to the potential speed (as
protracted by the current polar) when on a direct course towards the mark.
Note: in certain conditions the Waypoint output may be greater than the pure speed output. If this is the case
the ship is following a different course to the mark to the direct one, and in doing so it is achieving
greater speeds.
Lay-lines
Displaying laylines
Select the function Display Laylines
The program asks you first to select the type of lay-lines type to be used:
You have three choices of laylines types, and each time you ask for laylines to be displayed you will need to decide which
of the three are preferred.
• True wind - Polar
This is the most common mode; the laylines are displayed using the actual measured true wind direction taking into
account values indicated by the loaded polar.
• Heading - Polar
This mode can be used when the actual measured true wind does not show direction (the direction at the top of the mast,
where the measurement is taken is very different from the average wind direction).