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Thread: Conversion of wartime grid references to modern day OS grid reference or lat and long

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    Default Conversion of wartime grid references to modern day OS grid reference or lat and long

    Does anyone know how to convert the grid reference shown on an aircraft accident card to a modern day grid or lat/long. I am trying to work out exactly where the following is:

    174527

    It is somewhere near RAF Breighton.

    Many thanks

    Daz

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    did the map reference have a two character prefix ? the ones in burma did, and it required copies of war time maps to decipher..

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    This is the conversion tool most people seem to use, http://www.echodelta.net/mbs/eng-translator.php, wA174527 corresponds to 53 47' 15'' N 0 56' 00'' W which when I put it into Memory Map gives a current OS ref of SE 704329.
    Last edited by alclark; 31st August 2015 at 20:13.
    Alan Clark

    Peak District Air Accident Research

    http://www.peakdistrictaircrashes.co.uk/

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    Quote Originally Posted by alclark View Post
    This is the conversion tool most people seem to use, http://www.echodelta.net/mbs/eng-translator.php, wA174527 corresponds to 53 47' 15'' N 0 56' 00'' W which when I put it into Memory Map gives a current OS ref of SE 704329.
    Thanks very much that is certainly the right area.

    Daz

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    Hello Daz

    To add to the links you can view a wartime map of the area on the following link http://digitalarchive.mcmaster.ca/is.../macrepo:65222 which is overlaid with the military grid.

    A fantastic map resource!

    Kind regards
    Pierre

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    Pierre, that's very useful thanks for pointing it out.

    Using the period map I have plotted the map reference and it is in a different position to the conversion using the tool I linked to, the Y axis seems to be about correct but is 100 or so metres too far east on the X axis. I now have it on the western side of Derwent.
    Alan Clark

    Peak District Air Accident Research

    http://www.peakdistrictaircrashes.co.uk/

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    Alan

    There is a warning on the converter to say you have to allow for conversion tolerances of "150 to 1000 metres on the field"; so I have learned that you have to be careful with it

    Regards

    Pete
    Last edited by PeteT; 2nd September 2015 at 13:30. Reason: More info. re tolearnce levels added
    Main areas of research:

    - CA Butler and the loss of Lancaster ME334 (http://rafww2butler.wordpress.com/ )
    - Aircrew Training (Basic / Trade / Operational / Continuation / Conversion)
    - The History of No. 35 Squadron (1916 - 1982) (https://35squadron.wordpress.com/)

    [Always looking for copies of original documents / photographs etc relating to these subjects]

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    Quote Originally Posted by 78SqnHistory View Post
    Does anyone know how to convert the grid reference shown on an aircraft accident card to a modern day grid or lat/long. I am trying to work out exactly where the following is:

    174527

    It is somewhere near RAF Breighton.

    Many thanks

    Daz
    Hello Daz

    No need to convert, I have the whole of Yorkshire and more 1" to 1 mile, GSGS (Geographical Section, General Staff) War Office (WR) War Revision OS Grid sheets in colour, I will photograph the relevant part of the map tomorrow with the nearest grid lines along edge/across map. If you are still on the same email, I will still have your e address.

    That Whitley shot down by one of our Fighters near the English coast, claimed to be empty, but being flown back and forth along the coast, at the time of shoot down claimed by our fighter. Well, I managed to get the front of the AM 78 Aircraft Card, but for some strange reason, they can't supply the reverse, because the AHB decided not to film the reverse, I wonder why?

    Regards Mark
    Last edited by Mark Hood; 3rd September 2015 at 09:48.

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    Hello Daz

    According to the War Revision (Overlaid by the GSGS Cassini Grid) map, if you look for the lower 'T' road junction in Breighton village, where the southern road leg from that road junction goes to a "Moat" and a dead end.

    Your grid reference 174527 is about 3/4 (three quarters) of a mile South-west from that 'T' junction.

    The War Revision 1" to 1 mile maps I have and those identical in the ZOS 3 Series Reference at TNA, Kew, are 4 figure grids, therefore your six figure grid reference is 17 and 4/10ths of a square x 52 and 7/10ths of a square (the third and sixth figures of your reference, become tenths of a square on a four figure grid map).

    Looking at the specific War Revision Map Sheet emailed you, grid reference 174527 is at about the second letter 'o' in the word "Bowthorpe" on/near the Western bank of the River Derwent, about 3/4 of a mile SW of that lower 'T' junction (described above) in Breighton village.

    Mark
    Last edited by Mark Hood; 3rd September 2015 at 10:35.

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    Mark

    Thank you very much.

    Regards Daz

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