AREA TO BE AVOIDED Mariners are warned to navigate with extreme care in the approaches to Bermuda due to the extensive and dangerous fringing reefs. In order to reduce the risk of stranding, an IMO-adopted Area To Be Avoided has been established covering the northern coast of the islands and the offshore reefs. All vessels carrying cargoes of oil or hazardous materials and all other vessels over 1,000 gt should avoid this area. See Admiralty Sailing Directions for details of limits.