Markervuur Race 2026

Route data and coordinate assumptions

Routes from Appendix A/B. Coordinates are loaded live from RWS/PDOK Vaarwegmarkeringen Nederland: both drijvende and vaste collections. F is calculated per route as a temporary yellow inflatable mark: 0.6 NM from the start area centre in the route principal wind direction. It is included in GPX as an approximate planning point. FL42 has a fallback at RWS WRD/Waterinfo location Markermeer Midden if it is not present in the markering collections.

Loading RWS marks...

Optional. Enter 1–360°T to calculate signed True Wind Angle for every leg.

Selected route

Missing / ambiguous marks
Start/finish area assumptions
Data source & matching

Coordinate display: selected-route table shows GPS as degrees and decimal minutes (DDM), suitable for manual entry on a plotter. GPX/CSV still also use decimal degrees internally.

Rounding side icons: ↺ BB = pass/round on bakboord ↻ SB = pass/round on stuurboord

True Wind Angle: enter a True Wind Direction above to calculate TWA per leg. The app uses the signed shortest difference TWD - TT. Positive values are displayed with a trailing minus to match your example, e.g. 080-; negative values use a leading minus, e.g. -070.

Bounding box:

Collections:

Coordinates are read only from GeoJSON geometry in CRS84: [longitude, latitude]. Leaflet/GPX then receive latitude, longitude. This avoids projection/axis mix-ups.

Aliases include MZ1 for the route entry that was printed as MZ, MZ3 for the route entry that was printed as M23, FL42/FL 42, IJM22/IJM 22, MN1-GZ2/MN1/GZ2, and spacing variants such as Sport H/SportH.

Selected route mark
Start/finish area centre
Other relevant route mark
Manual fallback if needed