Thanks for fast answer.
I assume difference is ~9 meters depth to pick contacts in TDW's mod and this:
04/06/2011 Change GDG Hydrophone Min depth from 0 to -5 Meters
04/06/2011 Change KDB Hydrophone Min depth from 0 to -8 Meters
in yours?
And if i will want to use TDW_No_Hydrophone_On_Surface_1_1_0, i should overwrite only UBoot_Sensors.sim? UBoot_Sensors.GR2 should stay from your mod?