Module sailing 

Velocity made good and laylines.

Structs

TackLegs

How far to sail on each tack to fetch a mark dead to windward.

Constants

LAYLINE_LENGTH_FACTOR

How far past the mark a layline ray reaches from layline_rays, as a multiple of the vessel’s own current distance to the mark – long enough that the ray always extends past wherever the vessel actually is on the chart, short enough that it does not dominate a zoomed-in view. A fixed on-screen length cannot do this: it would either vanish at ocean scale or blot out a marina at pier scale. pub so every client draws the same length rather than picking its own.

TACK_RAY_LENGTH_NM

How far a tack ray reaches from the vessel in tack_rays.

Functions

close_hauled_headings_deg

The two close-hauled headings for a given wind, degrees true.

layline_rays

The two laylines through mark, as ray endpoints from mark itself – (mark, starboard_end, port_end) – or None when mark does not need a beat at all.

tack_legs

Splits the distance to an upwind mark into one leg on each tack.

tack_rays

The vessel’s own two close-hauled headings right now, as ray endpoints from vessel itself – (starboard_end, port_end).

vmg_to_waypoint_kn

Speed made good directly towards a waypoint, knots.

vmg_to_wind_kn

Speed made good directly to windward, knots.