Edging will improve your ability to turn your kayak. Edging is used in a wide range of paddling environments from flat water to powerful surf, particularly for non-ruddered kayaks.
By edging your kayak you change its underwater profile. Edging will also reduce the waterline and lessen the amount of resistance between the hull and the water. The greater degree of edge applied, the greater the effect on your kayak.
Imagine your body divided into 3 parts - your head, upper and lower body - each acting independently.
To edge your kayak: