SurvX - grid and geoid file - coordinate system KROVAK (JTSK)

I would like to ask, if it is possible, to get a grid and geoid file somewhere(for SW SurvX)?
For coordinate system (KROVAK-JTSK), Czech Republic.

geoid file - *.GGF/SGF/UGF/GSF
grid file - *.gsb

Thank you

Try these World Grid Shift Files - Powered by Kayako Help Desk Software , World Geoid Models Download - Powered by Kayako Help Desk Software . These work in SurPad, and SurvX is a very similar application.

Thank you very much, the grid file will probably go to use! The geoid file has a different file extension (*. BYN). SurvX can use the following * .GGF / SGF / UGF / GSF

pm me

I couldn’t find a way to write pm :). Please can you write me an email:
Thank you

Hello Tomas!
You could download the Czech grid (gsb)and goeid(sgf) file from the link below:;
The data also from FG website, and the geoid file byn I had converted it to sgf.

Thank you very much!