<p>I am finding angle between ship's heading and component in wave (wave's angle of attack), not sure if ES is a right place to ask this type of question.</p>

<p>Should it be the difference between mean wave direction and vessel's azimuth.</p>

<p>Thank you for your time and concern reading my question,</p>

<p>Sincerely,</p>

CC BY-SA 4.0
2019-06-05T18:19:27.623Z
Sorry, I should make it more clear. Are there any different between vessel's heading and the azimuth. Let's say I am moving from 1 coordinate (lon 1, lat 1) to the other coordinate (lon 2, lat 2), vessel heading is calculated from 

Four-quadrant inverse tangent between sin(delta lon) * cos(lat2) and cos(lat1) * sin(lat2) - sin(lat1)*cos(lat2)*cos(delta lon)

. While for azimuth, I am taking into account of  'World Geodetic System 1984'
Ewok The Sith Lord
CC BY-SA 4.0
2019-06-06T13:59:47.193Z
Hi Friddy, I am calculating vessel's speed loss during the effect of adverse weather. Wave is one of the main component and to do so, a relative angle between vessel and wave has to be treated as input. Do you know any source provide formula calculating vessel's heading beside Mercator Sailing Formula
Ewok The Sith Lord
<oceanography><ocean-currents><ocean-models>
Finding vessel and wave's angle of attack
Ewok The Sith Lord
# Finding vessel and wave's angle of attack

(Asked by: username_0 on 2019-06-04)

I am finding angle between ship's heading and component in wave (wave's angle of attack), not sure if ES is a right place to ask this type of question.

Should it be the difference between mean wave direction and vessel's azimuth.

Thank you for your time and concern reading my question,

Sincerely,

**Tags:** oceanography, ocean-currents, ocean-models

> **Comments:**
> **username_0**: Sorry, I should make it more clear. Are there any different between vessel's heading and the azimuth. Let's say I am moving from 1 coordinate (lon 1, lat 1) to the other coordinate (lon 2, lat 2), vessel heading is calculated from   Four-quadrant inverse tangent between sin(delta lon) * cos(lat2) and cos(lat1) * sin(lat2) - sin(lat1)*cos(lat2)*cos(delta lon)  . While for azimuth, I am taking into account of  'World Geodetic System 1984'  
> **username_0**: Hi Friddy, I am calculating vessel's speed loss during the effect of adverse weather. Wave is one of the main component and to do so, a relative angle between vessel and wave has to be treated as input. Do you know any source provide formula calculating vessel's heading beside Mercator Sailing Formula  

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