Before revision: Separation between MSL and LAT for the UK and Eire Vertical Offshore Reference Frame (VORF 2008) Vertical Offshore Reference Frames (VORF) is a set of high resolution surfaces which together define a vertical datum for hydrographic surveying and charting in the United Kingdom and Ireland.
After revision: , published and maintained by the UK Hydrographic Office,Separation between MSL and LAT for the UK and Eire Vertical Offshore Reference Frame (VORF 2008) Vertical Offshore Reference Frames (VORF) is a set of high resolution surfaces which together define a vertical datum for hydrographic surveying and charting in the United Kingdom and Ireland.