Errata, August 1986 A versatile three-dimensional Hamiltonian ray-tracing computer program for acoustic waves in the atmosphere by R. M. Jones, J. P. Riley, and T. M. Georges NOAA Tech. Memo. ERL WPL - 103 On page 9, "sin" in equation (3.17) should be replaced by "sin é". On page 10, the denominator in the last fraction in equation (3.18) should have C replaced by C . ref Equation (4.27) on page 16 should have lower case ê replaced by ê. On page 45, the last line in the caption for Figure 9 should read: ****See Table 29 for details.