GRIBview by Theyr

Available for PC (Windows), Mac (OS X) and iPad (iOS)

Our weather forecasts have been the professional mariners choice for over two decades. Today, the Theyr brand has become synonymous with accuracy.

Using the most advanced weather modelling to produce the most accurate forecasts available today, GRIBview by Theyr provides you with:

  • The highest resolution weather forecasts built on super high-precision data from 10km down to 1km resolution on an hourly time step
  • Free global forecast data for a highly compressed and very efficient overview of the oncoming weather
  • One-click access to unrivalled granular and detailed forecast accuracy for your favourite sailing areas
  • GRIB download functionality for further offline use during your maritime activities
  • Free offline charts which don't require an Internet connection to view

Our forecasts are used by many of the world's best known maritime organisations, businesses and professionals. From the most successful Olympic sailing teams and Americas cup teams to the biggest commercial names in the industry.

Save and name your favourite areas for single click downloads of multiple parameters, view files offline at any time.

Quick start:

  1. Download free Mac or Windows version.
  2. Register. If you previously registered for any theyr product please use those login details.
  3. An activation email is sent to your registered email address, click to activate.
  4. Open GRIBview. Enter your user id (email address) and password under the connection button.


Free level:

  1. Zoom/Pan the map to your required areas
  2. Hot buttons (weather icons) download and animate 6 days if forecast data (default is GFS 1.0 degree data)
  3. Click highlighted hot buttons to replay animation or use the animation control to step through the forecast.
  4. Eye icon clears the screen
  5. "Open saved" button or click on screen to open saved files. Click on saved file to display.
  6. Click on any map point and select the meteogram option to display meteogram at that point.


Subscription levels:

  1. Hot buttons provide immediate download and animation of data for high res areas
  2. Buoy: click to display buoys, click on buoy to display data for that buoy. Last update time is noted.
  3. Res area: Choose the forecast area from the expanded menus.
  4. Advanced settings:
    • provides options to change the time step, forecast hours and the number of parameters.
    • Res area and display area are selected in the main UI.
    • Set and name favourites.
    • Email data for a favourite area, settings and parameters to your registered email address for a selected period
  5. Meteograms
    • Online: Click on any point on the screen to display a value table for that point.
    • Offline: Click on any point within the data you have open on screen.
    • Graph: click to expand to a full meteogram
    • Slider: use the slider in meteogram to view time specific values.


Low precision: 1.0°Standard precision: 0.08-0.1°High precision: 0.01-0.04°
Coverage: GlobalView coverage mapView coverage map
Group and single mode displayGroup and single mode displayGroup and single mode display
Wind speedWind speedWind speed
Wind directionWind directionWind direction
Pressure (Sea level)Pressure (Sea level)Pressure (Sea level)
Air temperatureAir temperatureAir temperature
 Wind/Wave heightWind/Wave height
 Wind/Wave periodWind/Wave period
 Wind/Wave directionWind/Wave direction
Value tableValue tableValue table
 Sea Surface Temperature 0.018°Sea Surface Temperature 0.018°
 Live buoy dataLive buoy data
 Email forecast 1-30 daysEmail forecast 1-30 days
 Save settingsSave settings
  Tidal stream (N.W. Europe)
Why subscribe?£11.99 per month or £99.99 per annum£23.99 per month or £199.99 per annum