[Proj] Convert coordinates from ED50 to Greek Grid

leonidas leonidas_liakos at yahoo.gr
Thu Jun 23 04:43:03 EST 2011

I need to convert some coordinates from ED50 (EPSG:4230) to Greek Grid
(EPSG:2100).I'm using the following parameters for cs2cs:
cs2cs +init=epsg:4230 +to +init=epsg:2100
but compared to already valid results, the output greek grid coordinates are
wrong. Do I have to use any datum shift. And If so, what are the appropriate
parameters for that? 

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