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