A sequence of 80 mean inclinations obtained from successive 2-day orbital arcs of a U.S. Navy navigation satellite (1967-92A) has been used to obtain M2 ocean tide parameters. By assuming solid tide parameters of k2=0.30 and Δ2=0¿ the implied observation equation on terms of order 2 and degree 2, 4, 6, ..., is (3.8''¿0.60) ¿10-2 sin <wt+(331¿¿10¿)>= (0.99''/cm) ¿10-2 C22+ sin (wt+&egr;22+) +(0.94''/cm) ¿10-2 C42+ sin (wt+&egr;42+)+..., where w=1 cycle/13.58 days and t is the time in mean solar days from 1900.0. This observation agrees well with published numerical solutions of Laplace's tidal equation.