@idefix37 Thanks for explaining that. Now I know how to read it properly. Appreciate your time.

@Laurids Hi, here is your screenshot: [image: 1604821220106-763377cc-ca9e-40fa-9de2-63ecb060da96.jpeg] The Meteogram shows Waves which is the ‘total sea’ i.e. the wind waves + the swells. Swell (Swell 1), height and period On the map there is Swell (swell 1 and swell 2), but Waves is not shown in the map arrows, only the wind speed and direction (Wave is shown before you press the amber arrow in picker) Swell in Meteogram with 0.1m and 4.8s matches Swell in map arrow with 0.1m and 5 s. That’s NOT an issue ! Find here additional information on wave types https://community.windy.com/topic/6392/swell-maps