@Christophe-Denis Please could you at least show a screenshot to make your question a little less imprecise?

@fosojedi said in Incorrect Wave direction in Route Planner: Based on other information, the model detail is accurate per the model, while the route planner is not. Route planner seems to be showing completely different wave directions. Where have your seen that Route planner is not accurate ? Your issue about Waves direction is probably due to a wrong reference direction for wind and waves. See More option and set the reference direction (wind barbs) to North up.

@Tomber42 On given day/hour, wind wave and swell were collinear so swell arrow overlaps wave arrow. Now, at the same location, we have [image: 1662535634081-8a16641d-1514-4170-b5ca-59ae9efb89cb-%CE%B5%CE%B9%CE%BA%CF%8C%CE%BD%CE%B1.png] and on Thursday (noon) .... [image: 1662537680721-8f988717-4e24-4e69-ae60-95f45c0c03d5-%CE%B5%CE%B9%CE%BA%CF%8C%CE%BD%CE%B1.png]

@idefix37 right now, if we got rid of the values on the land, data for inland water areas wouldn't be available at all.

@bob71 The Swell2 arrow does not always show zero. Here it shows 0.4m: [image: 1595406448296-capture-d-e-cran-2020-07-22-a-10.22.30.png]

@barbaracvilla https://community.windy.com/topic/12564/wavewatch-3-wave-period-values/2

@afurley All waves models don’t take into account the effect of current. For WAM model from ECMWF(July 2018): « Considerations when using output from ECWAM Not yet modelled are the interaction of waves with sea-surface currents. In particular areas, (e.g. Gulf Stream or Agulhas current), the current effect may give rise to localised changes of up to a metre in the wave height » From https://confluence.ecmwf.int/plugins/servlet/mobile?contentId=131397261#content/view/131397261 For WWW3 model it seems to be different (March 2019): https://github.com/NOAA-EMC/WW3/wiki/Manual Page 1 « The model [....] computes other transformation processes such as the effects of surface currents to wind and wave fields, and sub-grid blocking due to unresolved islands » Page 163 « 3.9 Winds and currents Model input mainly consists of wind and current fields. Within the model, winds and currents are updated at every time step ∆tg and represent values at the end of the time step considered. » In any case it would be much better for you to sail downwind and down swell. But this is quite tricky in the Agulhas current area, the swell being mostly from SW. Don’t you plan a stop in Durban? Concerning receiving data via satellite phone: https://community.windy.com/topic/6601/offline-use-of-windy

I agree this would be helpful for fishing as well. Thanks

So, this is Windy android app version 14.4.2 .................... And this is windy.com version 14.8.0 .................... At almost the same location and time. [image: 1524058973908-luxcalor_swells_3_resized.jpg] ... [image: 1524058995385-luxcalor_swells_4_resized.jpg] Hope it helps. All the best!

@tubbssurf ECMWF-WAM and WW3. We use both and you can choose