If the wind speed and direction would not change – it would not matter what course you take and when you tack when reaching the mark. Geometry is simple.
Mark is displayed on the compass rose relative to boat heading.
Red color means that this is port rounding mark, green – starboard, yellow – gates.
Following parameters might be used navigating the mark:
The mark after is displayed as a smaller gray circle.
If the polar is configured, laylines are calculated automatically from a polar data as the most efficient angle to the wind. If polar is not selected, laylines are calculated from a tack/jibe angle.
Time to layline (and a distance to layline) might be selected as an additional parameter. It is calculated using 6 minutes average values of boat speed, boat heading, wind speed and wind direction.
SailRacer keeps track of the heading, calculates average and indicates a shift on a main compass rose.
The middle line between red and green bars is the 6 minutes average heading. The width/size of red and green bars indicates the maximum shift during 6 last minutes.
Numeric heading value and a graph might be selected as an additional parameter.
If you have on-board NMEA to WiFi transmitter, it is possible to configure app to receive wind data automatically.
SailRacer keeps track of the wind direction and speed changes, calculates averages and displays a wind shift on a main compass rose, and in 6 minutes and 1 hour graphs.
Depending on your position in a course, graphs are colored in red and green colors. If the wind direction curve in waving on a red area – port tack is more efficient, green – starboard.
Thin curve represents the wind speed.
Following parameters are available to monitor the wind:
If the polar is configured, the efficiency parameter is displayed on the main compass rose. Efficiency % = ( Actual speed / Target speed from polar ) x 100.
If SaiRacer indicates the current (from COG/SOG difference from compass heading and water speed) it displays affected by current laylines (dashed lines) .
In the example above there is a current from the west, boat sails on port tack down wind. Jibe to a starboard tack should be done when mark crosses the dashed line and current will help to make a mark.
Current (speed and direction) might be selected to display as an additional parameter.