NOTES 1.- Mariners in this area must always observe the Regulations for Preventing Collisions. 2.- Mariners must observe the regulations in force, issued by the competent authority, for navigation in the waterways covered by this chart. WARNING 1.- Prudent mariners should not rely entirely on floating aids to navigation, as they may be out of position due to various external factors. 2.- Mariners must observe navigation restrictions in the vicinity of breakwaters that have been partially or completely destroyed due to lack of maintenance. CAUTION Depths in channels and estuaries vary continuously.