What is a 6 grid reference for the most western point in island?
A 6-digit grid reference would typically divide the island into 100m squares. For the most western point of an island, the 6-figure grid reference would specify the square in which the point lies, such as "NN123456". You would need a map or grid system in order to determine the exact 6-figure grid reference for the most western point on a specific island.