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How do I determine my location and altitude?

Knowing where you are might seem rather obvious but when logging weather events and setting up web sites etc., it is useful to be able to state with some precision a location in terms of latitude and longitude and/or by grid reference.

For the UK, then it is recommended that you use http://www.streetmap.co.uk/ or http://www.multimap.com/ then if you use the search facilities (I find the Post Code method good), you will find a read-out of the location.

The best way to determine your altitude above mean sea level (again UK only), is to use an Ordnance Survey map with contours marked at 5m intervals. Use this link: http://www.ordnancesurvey.co.uk/oswebsite/getamap/ accept the terms/conditions, then use the search facility to find your location and zoom in to the maximum extent. It should be possible to determine with acceptable accuracy the height using the contours and spot heights given.