Recent searches
Search options
Self-educated carpenter and clockmaker John Harrison, who died OTD in 1776, invented the marine chronometer, finally providing a means of calculating longitude while at sea https://cromwell-intl.com/travel/uk/national-grid-os-maps/?s=mb #travel #Britain #history
Bob's Pages of Travel, Linux, Cybersecurity, and MoreNavigating with the National Grid system and OS MapsHow to navigate using the National Grid system and Ordnance Survey maps: GPS references and simple line of sight techniques for finding your way around Britain. It's similar to the UTM grid system.
