46 CFR § 108.621
Equipment markings: General
April 15, 2021
Unless otherwise provided, each marking required in this subpart must be—
(a) Printed in English;
(b) In red letters with a contrasting background;
(c) Permanent;
(d) Easy to be seen;
(e) At least 1.3 centimeters ( 1⁄2 inch) in height.