Flags and signs On patrolled beaches, RNLI lifeguards designate the safest areas to bodyboard with red and yellow flags. We willbodyboard between these flags; they indicate the lifeguarded area for bathing and bodyboarding. Black and white flags indicate the safest place for surfers and hard craft, like kayaks. Having separate areas means we won’t be sharing waves with those using larger, more dangerous equipment so there are no worries about collisions.