I tried using the NGRs shown in Volume 2 but can't get the NGRs to fit. Clearly I am doing something wrong!
For example, using Appendix Page A17 (Twyford) for Station 53C Transmitter and the stated NGR (no Alpha prefix is shown) of 467794 226088 and the prefix SP I end up in Rousham to the SW of Upper Heyford using the WTP3 Search function.
Manually, using an NGR squared atlas I get significantly different NGR
I think you have to drop the first numbers if you use the grid letter prefix so it should be SP 67794 26088.
It is quite common for GIS systems to use those all number NGRs, I hate them but presumably it is easier for computers or perhaps more accurately easier for computer programmers - many can't even handle the UK NGR allowing a reference to be given as AB 12, AB 19 29, AB 199 299 etc though a system that I upload images to, has someone who keeps making a fuss about NGRs not being ten digit. So he adds "01" to each half, not understanding that it falsely makes it look as if the NGR is more accurate than it actually is.
PastMap displays both formats
NN 15393 70374
[ 215393, 770374 ]
By the way I was looking up some Welsh locations last week and struggling to get a ten figure NGR, I can get one on the OS mapping but can be hard to locate the exact point in urban areas. So I suggested that COFLEIN and ARCHWILIO should have a way of reading NGR from their maps. They suggested this site.
Thanks. It occurred to me that the author would have given an explanation of the numerical NGR and so I looked through the preamble in Vol 1 Page 10 but still didn't understand.
The Historic Wales site has Englandshire greyed out but the mapping continues to work, you can zoom in for detailed maps and still read off the NGR. PastMap does not have large scale mapping outside Scotland.
CORRECTION - the mapping displays but you cannot read off the NGR. I must have still been near the border when I checked earlier.
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