SimSail is a free software for planning sailing routes. It allows to find the best route by visualising 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 oft 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. Like any simulation tool, SimSail requires some time to exploit it. The interface tries to reduce the complexity of the software by grouping the functions and allowing a quick access to the most used functions.

English, French or Dutch languages.

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

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

  • Maps raster BSB and OpenStreetMap (and OpenSeaMap)

  • Auto save of the session of work

  • 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)

  • Email requests for Saildocs® and Great Circle®

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

  • Routes, marks, barriers and TSS in GPX format

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

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

  • GPS connection with display of all the navigation data

  • AIS (Automatic Identification System)

  • Weather graph and Tide graph

  • Routing by Isochrones or by Course made good

  • Routing with multi gribs of wind and current

  • Routing on several legs of route

  • 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

  • Routing on multiple segments of route

  • Recording of the routings

  • Routing from the boat

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

  • Analysis of the corrected times between different boats

  • Automatic routing or control of all parameters

  • Routing time step from 1 min to 6 hours

  • Numerous tools of visualization of the routing

  • More than 500 polars provided with possibility to modify them (some come from

  • Loss of speed integrated during tack

  • Selector of configurations of boat (4 configurations)

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

  • Sea state setting

  • Statistics of the routing

  • Display of all conditions met on a route step by step

  • Record and analysis of trace

  • Tests of performance

  • Complete tool of measure of distance

  • Repeaters with graphs

  • Simulation in order to configure repeaters