This report describes an empirical tide model for the western North Atlantic ocean 1vhich predicts the semi-daily and daily tides relative to mean sea level. The model interpolates harmonic constants from three reference stations on a Mercator projection to obtain constan.ts at a given location, from which the tides are then computed. The geographic region over which the model predicts tides within a standard deviation of 5 em was determined through a comparison with data from test tide stations. A set of FORTRAN subroutines and their use are described, allowing a user to implement the model. Minor modifications of two subroutines are required to extend the period of the model 1973-1978 to either earlier or later periods.

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