This calculator allows you to convert from Mach (20°C, 1 atm) to Velocity of sound in sea water (20°C, 10 meter deep) and in a reverse direction. To convert from Mach (20°C, 1 atm) to Velocity of sound in sea water (20°C, 10 meter deep), enter the amount of Mach (20°C, 1 atm) into the first input and to convert from Velocity of sound in sea water (20°C, 10 meter deep) to Mach (20°C, 1 atm), enter the amount of Velocity of sound in sea water (20°C, 10 meter deep) into the second input.