It is not possible even when using the highest order of survey techniques to achieve perfect accuracy when drawing/digitising features on a map. OSI maps are therefore subject to accuracy limitations. This means that scaled measurements between features shown on the map may not exactly match the actual distance measured between the same features on the ground. Different levels of accuracy apply depending upon the scale of the map and the original method used to create it.
Paper maps (particularly copy maps included in deeds) can be subject to distortions and inaccuracies, as any copying processes (such as photocopying, scanning) and printing processes can lead to the distortions in the map image.
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