I was wondering, just how accurate are the OS Explorer maps? The reason I ask is that when I take a bearing using a Silva Ranger 15TDCL compass (with the declination adjustment set as per map guide) on my local church spire (about 1/2 mile away) from my home, when I transfer reading to map, it is spot on. As is the reading / bearing to the top of a hill nearby (about 2 miles). ....so what is the problem I hear you ask?
When I do exactly the same, with a transmitter tower about a mile away, it is way out. Unless someone has moved the transmitter 1/2 mile down the road , (unlikely, but anything's possible I suppose!) - the only thing I can think of is that the map is wrong.
I get exactly the same degree of error when using a different compass and manually adjusting for declination.
Its the only transmitter anywhere in the area, so I can't be mistaking it for another one nearby.
I hate to think of the map being wrong. I don't like to think that in a potential survival situation, that the map is nothing more than a rough guide to where things are, especially the renowned OS Explorer maps. Perhaps I'm being over-fussy, or my map reading / compass skills need work, or I am looking for too much precision, or maybe there's a much simpler solution that I'm just not seeing (the 'doh' factor).
So over to you, any ideas? or similar experiences?
Thanks in advance