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SOURCE:  HURRICANE MANUAL FOR MARINE INTERESTS published by Florida Inland Navigation  District

General Precautions for
Boat Owners
Trailerable Boats
1. Determine the requirement to load and haul your boat to a safer area. Be sure your tow vehicle is capable of properly and adequately moving the boat. Check your trailer tires, bearings and axle should all be in good condition. Too often a flat tire, frozen bearings or broken axle prevents an owner from moving a boat.  
2. Once at a “safe” place, lash your boat to the trailer and place blocks between the frame members and the axle inside each wheel. Owners of light weight boats, after consulting with the manufacturer, may wish to consider letting about half the air out of the tires, then filling the boat one-third full of water to help hold it down. (The blocks will prevent damage to the springs from the additional weight of the water.)  
3. Secure your boat with heavy lines to fixed objects. Try to pick a location that allows you to secure it from four directions, because hurricane winds rotate and change direction. It can be tied down to screw anchors secured in the ground. This is what can happen to boat owners who do not take proper precautions.
Non-Trailerable Boats in Dry Storage
1. Determine the safest, realistic, obtainable haven for your boat and make arrangements to move your boat there. When selecting a safe location, be sure to consider whether storm surge could rise into the area. Wherever you choose to locate your boat for the duration of the hurricane, lash the boat to its cradle with heavy lines and consider, based on the weight of the boat, adding water to the bilge to help hold it down.
 2. Never leave a boat in davits or on a hydro-lift.
Non-Trailerable Boats in Wet Storage

 The owner of a large boat, usually one moored in a berth,
has three options.

 1. Secure the boat in the marina berth.
 2. Moor the boat in a previously identified safe area.
 3. Haul the boat. Each action requires a separate strategy. Another alternative, running from the storm is not encouraged except for large commercial vessels.
Boats Remaining in Marina Berth
1. Double all lines. Rig crossing spring lines fore and aft. Attach lines high on pilings to allow for tidal rise or surge. Make sure lines will not slip off pilings. Inspect pilings and choose those that seem strongest and tallest and are properly installed.
2. Cover all lines at rough points to prevent chafing. Wrap with tape, rags, and rubber hoses, etc. Install fenders to protect the boat from rubbing against the pier, pilings and other boats.
Diagram for surcuring boat
  The longer the docklines, the better a boat will be at coping with high tides. It is also essential to double up on all lines and use chafe protectors at any potential chafe points.
3. Assess the attachment of primary cleats, winches and chocks. These should have substantial back plates and adequate stainless steel bolt sizes.
4. Batteries should be fully charged and checked to ensure their capability to run automatic bilge pumps for the duration of the storm. Consider backup batteries. Cut off all devices consuming electricity except bilge pumps.
 5. Do not stay aboard. Winds, during any hurricane, can exceed 100 mph and tornadoes are often associated with these storms. First and foremost, safeguard human life.
Other Information / Diagrams

Diagram for surcuring boat

Reinforced and properly backed cleat. Note the washers and the backing plate. These are essential in a hurricane and a good idea in quieter times as well.
Diagram for surcuring boat
Storm moorings, whether at dock or otherwise, should have doubled lines. The second set of lines should be a size larger than the normal lines, including spring lines at a dock.
  Diagram for surcuring boat
The best offshore mooring location for a vessel to ride out a storm is in the center of a canal or narrow river where at least doubled mooring lines can be secured to both shores, port and starboard, fore and aft.
  Diagram for surcuring boat
  
  For more information contact MIATC.
 
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