@Squid-Mahn63 In other words you want a waves period layer. Same as this topic. https://community.windy.com/topic/24576/wave-period-maps?_=1731182862060

@idefix37 thanks

@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 and @vsinceac, thank you both very much for the replies and information.

@saltyjoy In Settings choose ‘Display directions as number’ [image: 1623929300010-24002704-e5f9-43ad-97e3-d2dfea289e7a.jpeg]

@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]