The preponderance of recent determinations of distilled‐water sound speed indicates that the Wilson (for the range 0°–30°C) and Greenspan‐Tschiegg sound‐speed equations are too high by 65 and 40 cm/sec, respectively. Similarly, the Wilson seawater sound‐speed equation gives Pacific temperate latitude Sofar speeds23 m/sechigher than values based on explosion travel times. Adjusted distilled and seawater equations are proposed in order to achieve a common standard for all measurements at sea.