Weather4D Routing is an outstanding meteorological and routing application based on weather and ocean data in GRIB format as well as the speed characteristics of the sailing boat (polar) and its minimum speed when operated with its engine. It benefits from an interface derived from the “Routing & Navigation” version.

GFS model is provided by default. In addition, over 35 weather and oceanographic models are available with a yearly subscription (in-app purchase). Queries and downloads are fully customizable.

The application makes it possible to create your own geographical zones and to select the characteristics of the GRIB files to download: choice of data, resolution, periodicity, file size, etc. GRIB files can be downloaded wherever you are from our servers through a regular or satellite internet connection.

Weather4D Routing displays the combined data as layered layers. All the data of a selected model is displayed by an animation in continuous time scrolling or in manual scrolling on the map.

The weather forecast is displayed in one or two windows (iPad only), offering several display combinations of the same area: navigation and weather, weather and waves or currents, comparison of different models. The two windows can be disassociated for displaying the same area at different scales.

Weather4D Routing makes it possible to optimize sailing or engine, or mixed sail-engine routes. From a theoretical route, a routing algorithm will take into account wind force and wave height constraints. When sailing, the boat polar combined with wind and current forecasts will be used to optimize performance, comfort and safety.

Several routes can be displayed to compare the outcome of different options: different forecast patterns, departure dates and times, selected constraint values. The routing can be restarted at any moment during navigation from the actual position of the boat.

Default Models and Charts
GFS global forecast model at 0.25 °, 0.5 °, 1 ° and 2 ° resolutions.
BING global chart
OSM (Opens Street Map) global chart

Optional Models (in-app purchase):
GEM Global
COAMPS Europe, West Atlantic, Central America, East Pacific
ICON-EU Europe
ARPEGE Global, Europe
AROME France, Antilles, Guyane, Polynésie, Calédonie, Indien
WRF France, Europe, Greece, NW Africa, Azores, Lesser Antilles, Greater Antilles

MFWAM Global, Europe, France
FNMOC WW3 Global, Europe

MyOcean Global, IBI, NWS, Baltic, Med

What’s New

Version 2.0.44

- Update of the World Magnetic Model (WMM 2015v2).
- Bug fixes.

Ratings and Reviews

3.3 out of 5
4 Ratings

4 Ratings

8mobius ,


I’ve had multiple versions of this app for over four years now. I paid for previous versions of this app and in updating found that the large amount of free forecasting I use was now closed off to force a subscription model. If you don’t intend to get a full subscription immediately DO NOT BUY. This program also has been getting more and more buggy over time and the increase in features are not of a similar standard to other programs. It used to be there were few choices now there are a lot of other good programs that do the same with different approaches of equal value. These programs give better access to the government produced free models such as GFS and GEM. I question the ethics of a company that would one year have you pay on the higher end for an app promoting free access to free gov models and then without warning ‘upgrade’ you to charge by removing part of the data but still saying it was free. Somehow the company also removed the first version of this review. Interesting.

EllenNBA ,

Cautiously optimistic

Update: While the new app is not intuitive and lacks the useful, exportable grib files via email, the responsiveness and helpfulness of customer service from Frederic to solve problems and assist in learning this new software is EXEMPLARY. We are hopeful that once we learn the new functionality of Weather 4D we will like it as much as we did Weather 4D Pro (the older version)

electrochain ,

Unstable release with serious bugs

I was happy to see that there was an update on the weather4D app so I downloaded the latest release of it... Unfortunately the app crashes either right after startup or, after 5-6 restart attempts, as soon as you click on any of the buttons (I.e. Settings). I tried it on an iPad Air 2 with all other apps forced off (to ensure that the bug is not due to low memory).

It used to be a great software some years ago (good graphics) although the navigation through the globe was not very intuitive.

Hopefully there will be another update soon that will address the current "crashing" issue.

3 stars as motivation to work on a fix...


221 MB

Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, French

Age Rating
Rated 4+
© 2011-2018 Olivier Bouyssou All rights reserved.
In-App Purchases
  1. 1 Year HD Forecast Subscription $33.99
  2. 3 Months HD Forecast Subscription $16.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

More By This Developer

You May Also Like