§ 185.606 § 185.606 Escape hatches and emergency exits. All escape hatches and other emergency exits used as means of escape must be marked on both sides in clearly legible letters at least 50 millimeters (2 inches) high: “EMERGENCY EXIT, KEEP CLEAR”, unless such markings are deemed unnecessary by the cognizant OCMI.
46 CFR §185.606
46 CFR Part 185
TL;DR
All escape hatches and other emergency exits used as means of escape must be marked on both sides in clearly legible letters at least 50 millimeters (2 inches) high: “EMERGENCY EXIT, KEEP CLEAR”, unless such markings are deemed unnecessary by the cognizant OCMI.