Australian Data The Australian data on these disks were obtained from the Royal Australian Navy Hydrographic Service on 1994 MAR 15 by A.F. Marston. The Australian data includes 441 stations generally numbered as in the Admiralty Tide Tables (ATT) with a 0 added. The stations are listed in AUSSTA.LST. The constituents present and their speeds are given in AUSCONSR.LST. These are nominally 20 constituent sets, but the actual number varies from 4 (as in the ATT Part III) to 35 for Creech Reef (#58740). While these are the current "official" data, the RAN states that users must not use them to make predictions for Standard Ports since these may differ from the Daily Tide Tables which are based on up to 160 constituents and "are the only authorized predictions for Standard Ports." All of the constituents used by the RAN are included in the TIDES4 constituent set except that the RAN M1 has a speed of ĞM2 and is not the same as the NOS M1 constituent. RAN M1 appears only in station 58070 with an amplitude of 0.0179 m. It has not been included in the TIDES4 file 58070.TD4. (M1 values in other files have been inferred and are the NOS constituent.) The data in the RAN file has been extended using data from two other sources. The geographical location of the station (country, coast, etc.) and any relevant notes have been added from the 1991 ATT. If the only semi-diurnal or diurnal constituents given are M2, S2, K1 and O1, additional constituents are inferred using the formulae in the NOS SP98. This should give results comparable to the Simplified Harmonic Method used in the Admiralty and Australian tide tables for the same cases. The results are less accurate than for stations with a full complement of constituents. If SA and SSA are not included in the RAN file they have been added using a Fourier analysis of the table of Seasonal Variations in Mean Sea Level in the 1994 Australian Tide Tables. Again these are approximate values. Edward P. Wallner 1997 MAY 06 32 Barney Hill Road Wayland, MA 01778-3602 508-358-7938 epwallnr@world.std.com