Learn how to draw and measure angles with this BBC Bitesize Maths article. For students between the ages of 11 and 14.

Angles are measured using degrees, ranging from 0 all the way to 360 degrees in one full turn. There are many different types of angles, but possibly the most easily recognisable is the right angle.

Andy Horton and Dave Powlison explain the steps to simply determining the optimum downwind sailing angle.

Shift-Angle Method: A calibration technique that enables the measurement and correction of small angular errors beyond the limitations of traditional pitch-based methods.

Watch the demonstration video below to learn more about the PARA laser measure which is now available to back by Kickstarter with early bird pledges available from $179 or roughly £137.