Tide Stations: Water level observations are in centimetres (unless otherwise stated) and are typically in intervals of 60, 15, 5 or 2 minutes (specified in the header). All measurements are recorded to Australian Western Standard Time and to the local vertical datum as specified in the header (if known). Tide station locations are to GDA94, however some locations are an approximation only, particularly the historical tide stations and DoT does not provide any warranty as to the accuracy of the information nor as to its reliability.