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Naismith’s Rule has remained a staple on navigation syllabi across the country and is still used to this day, but what is it?

Part of its enduring appeal no doubt stems from its simplicity – a rule of thumb that can be employed with minimal mental strain is a great asset when navigating.

With this voucher, it enables you to download 25,000 sq km of Ordnance Survey 1:25k maps for Great Britain.

In this article we answer all the FAQ's regarding the Birdseye plus voucher.