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A six figure grid co-ordinate system is the standard method for maps. This system is used in the Global Positioning System.
Six figure grid reference can be find by first measuring eastings and than northings.
We use a six figure grid reference because it is more detailed and it will be better if you want to find the exact position of a place.
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The more numbers, the more refined it is. For example, a four digit grid coordinate will put you in a 1,000 meter grid square. A six digit grid will put you within a 100 meters of your position (or target), etc.