top of page

SimSail is a free software for planning sailing routes. It allows to find the best route by visualizing the conditions encountered in navigation.

The strength of SimSail is to access a very large number of parameters. If current data exists, the wind received by the boat for the calculation of the routing will be the wind-surface resulting from the combination of the current and the wind, which corresponds to the reality.

The routing can be multi gribs of wind and current, multi road segments and multi-boats including compensated times from ratings.


SimSail can be connected to a navigation data system in order to analyse the performance of the boat and compare the actual navigation data with the routing.

SimSail is a simulation tool because it artificially reproduces the operation of a sailboat in its environment, using a computer program for purposes of study, demonstration or explanation.



  • Maps raster SnMap (sold by ScanNav®)

  • Maps raster BSB, OpenStreetMap (and OpenSeaMap) and Google Maps®

  • World coastlines (resolution up to 100 m) with coastal cities and capitals

  • Mercator projection and Great circle with full scrolling in longitude (infinite map)

  • Connection to instruments (serial or wifi) with display of the boat position and all the navigation data

  • Laylines upwind and downwind

  • Repeaters with graphs

  • AIS (Automatic Identification System)

  • Complete tool of measure of distance



  • Grib file of wind (edition 1 and 2) with display of wind, gusts, isobars, precipitation, humidity, total cloud cover, temperature and convection

  • Grib files of currents and waves (edition 1 and 2)

  • All gribs of wind and current can be modified in intensity and lag

  • Atlas of currents from Belgium to La Coruña (Spain)

  • Reading of SHOM tidal streams (must be purchased from the SHOM website)

  • Direct request of gribs from Great Circle® (subscription required at Great Circle®)

  • Email requests for Saildocs® and Great Circle®

  • Weather graph and Tide graph



  • Automatic routing or control of all parameters

  • Routing sailing, dual with sailing and motoring with fuel consumption and, motoring only

  • Routing by Isochrones or by Course made good

  • Routing on multiple legs of route

  • Routing from the boat and/or to the active waypoint

  • Routing with multi gribs of wind and current

  • Integration of the current into all routing calculations (wind and boat)

  • Avoidance of coasts and barriers defined by the user

  • Avoidance of thunderstorms, weak or strong wind and high waves

  • Multiple routings by scan of variables (polar, wind – strength & lag, current – strength & lag, time of departure and several boats)

  • Numerous tools of visualization of the routing (display of all conditions met on a route step by step and global statistics)

  • More than 500 polars provided with possibility to modify them[1]

  • Analysis of the corrected times between different boats

  • Progress table

  • Routing time step from 1 min to 6 hours

  • Selector of configurations of boat (4 configurations) for rapid access

  • Loss of speed integrated during tack



  • Auto save of the session of work

  • Record and analysis of trace (NMEA)

  • Trace converter to CSV format

  • Tests of performance

  • Simulation in order to configure repeaters

  • Languages: French, English, Dutch, Spanish

  • Routes, marks, barriers and TSS in GPX format

  • High DPI Screen compatible

[1] some come from

bottom of page