WARNING The navigator should not rely entirely on the floating aids to navigation, because could be out of position due to factors external. CAUTION Depths in this chart vary constantly due to sediments that provides the Estero Salado. GRADES 1.- Sailors must observe the regulations current, issued by the Maritime Authority National, for navigation in spaces aquatics covered in this chart. MARINE PROTECTED AREA The coverage area of the nautical chart is located within the Production Reserve of El Salado Mangrove fauna, activities inside thereof will be subject to the provisions of the National Environmental Authority.