I dont know if this is the correct forum this, any help would be greatfully appreciated;

I have been trying endlessly to convert stereographic co-ordinates of hungary to E.O.V. which I think are from the Budapest System datum, as I know they are from the 19 60's 70's and this was the last stereographic system used in Hungary (They only state they are hungarian and stereographic).

I think I have a methodology to do this by first converting to Lat/Long using page 62 of this:

However I do not know the exact parameters of the Budapest system, namely the scale factor.

Could anyone help me? first to determine whether I am correct in saying it is the Budapest system and with any information on the Budapest System.


P.S. they are none military co-ordinates (Well locations for mining etc.)