To use the "Carter's 3rd Edition of Matthews Tables for converting depths (based on a sound speed of 1500 m/sec) to corrected meters ("true depth, corrected for variations in sound speed with depth), run the program "MATT_CON.EXE". The program will prompt for latitude, longitude, and uncorrected depth. A non-numeric value for latitude terminates the program. All source code is on this disc. The program "MATT_RAN.EXE" converts the ASCII files "MATT_TAB.ARE" and "MATT_TAB.DAT" to their binary equivalents "MATT_TAB.AAA" and "MATT_TAB.DDD". To use the conversion program, ONLY the "MATT_CON.EXE" and the binary data files need to be on your PC. The programs may be recompiled from their FORTRAN source code to run on other platforms, such as Sun. The PC binary files are valid on DEC hardware without modification. The PCprograms will also run from this disc. Complete documentation for the computations is contained in the program source code file "MATT_CON.FOR".