sail-world.com
 
 
News Home Photo Gallery Boats for Sale Sail-World Racing Cruising Int MarineBusiness-World FishingBoating Magnetic Is RW
Sail-World.com : Will your sailing boat's mast clear these hazards?
Will your sailing boat's mast clear these hazards?


'Will there be an overhead bridge or cable in this voyage?'    .

There are some dangers on inland waterways that don't occur in an open ocean. Look over any larger scale chart and you sometimes may see overhead power cables that span a narrow channel. Take care to make sure that your mast will clear the cable--before you attempt to pass beneath! Use these sailing tips for safety.

Correct Your Mast Height
Determine a total, corrected and conservative mast height for your sailing boat. For example, let's say your boat has a mast 38 feet above the water. If you installed a VHF whip antenna, masthead wind fly, or tri-color navigation light, that additional height would need to be added. Let's say two feet of antenna had been added to the original mast.

This would make the overall mast height 40 feet. As a final measure, I recommend an additional 10% or more, so add another four feet or so. Total mast height to clear would be 38 feet + two feet (antenna) = 40 feet (overall mast height) + four feet (10% additional safety factor) = 44 feet of clearance for safety.

Overhead Cables - potentially dangerous if ignored when planning your voyage - but how much height allowance is enough? -  .. .  
Know These Overhead Power Cable Symbols and Abbreviations
International charts often show cable vertical clearances inside brackets, but US (NOAA) charts, for instance, write cable vertical clearance within the descriptive note. Make sure you know how the chart you are consulting works. Check the chart notes (particularly if you are away from your home waters) to find out if this number indicates feet or meters.

International Charts
The second and third illustrations show cable strung between pylons with the vertical clearance shown in brackets. This symbol will often be found on International charts. NOAA charts show the vertical height clearance written on the side of the river bank along with the rest of the description (as shown in the first illustration). Heights are shown in feet or meters for clearances at high water. Always check your chart near the title block for the datum used for heights.

The fourth chart illustration shows a magenta height clearance between the brackets. This means that the power company or regulating authority has verified the indicated height clearance. Realize that vertical cable clearances are for the center of the waterway.

USA (NOAA) Charts
Look at the first chart illustration. The towers on each side of the waterway show a dot surrounded by a circle and are abbreviated in all Capital letters. This means the positions are highly accurate and the towers prominent.

The cable itself may or may not be as visible. In certain atmospheric conditions, it could be difficult to see from a distance. Always check your chart near the title block for the datum used for heights. In this case, heights are given in feet above mean high water.

Allow for Extreme or Unusual Circumstances
In places with extreme tides, take care to allow extra room at maximum high tide. Storm surge or heavy rainfall can add a lot to tidal height, as can spring tides--higher high tides and lower low tides than normal--twice a month at the new and full stages of the moon. If in doubt, find an alternative route to avoid a dangerous encounter that could result in costly damage or injury.

Nigel Calder, in his book 'How to Read a Nautical Chart', warns that some power transmission lines can have extreme voltages. These cables can discharge current without direct contact. Allow an additional clearance of two to five meters (Seven to 17 feet) or more if you see this warning on your nautical chart.

Use these sailing navigation tips to avoid the danger of overhead power cable contact with your sailing boat's mast. Keep your crew or partner and boat safe on the inland waterways of the world--wherever in the world you choose to sail.

~~~~~~~~~~~~~~~~~~~~

Captain John Jamieson (Captain John) shows you the no-nonsense cruising skills you need for safer sailing. Visit his website at Skipper Tips. Sign up for the free, highly popular weekly 'Captain John's Sailing Tip-of-the-Week'. Discover how you can gain instant access to hundreds of sailing articles, sailing skills videos, sailing tips newsletters and Free sailing topic e-Books!


by John Jamieson

  

Click on the FB Like link to post this story to your FB wall

http://www.sail-world.com/index.cfm?nid=119052

10:28 PM Wed 5 Feb 2014GMT


Click here for printer friendly version
Click here to send us feedback or comments about this story.







Sail-World Cruising News - local and the World













Pam, 90-year-old pearling lugger, to sail again by Sail-World Cruising round-up,












How sailors really do have a voice in the future of our oceans by Sandra Whitehouse, Sailors for the Sea,




Message-in-a-bottle record - 102 years by AFP/Sail-World Cruising,
















Canadian solo sailor rescued north of Auckland by Sail-World Cruising round-up,








Ipad and sailing boats in Australia/NZ - What works and what doesn't *Feature by Andrew Keays, Island Cruising Association,














Multihull Solutions Whitsunday Rendezvous 2014 – Entries sailing
SOLAS fundraiser to take place at Gosford Sailing Club
Laura Dekker presented OCC's Award of Merit Sat 05 April in Whangarei
Free online fuel spill course - how much do you know?
Smaller but plenty of space: The Nautitech Open 40
Product of the Week: Chafe guards save lines from friction
Government sneaks through the 'Affordable Boat Act'
Japan's Antarctic whaling program harpooned
Yacht of the Week: Kokomo III - and she could be yours
To Sea in a Sailing Ship: the glory days - at CYCA TOMORROW!
Life-shattering event sends 'rookie' couple sailing the world
Mysteries of the seas, happening right now - missing, sunk, foul play
Sail Norway and Russia this summer - your own boat, or charter
Sunshine4kids' 'Fleet of Hope' sets off again
3,200-year-old boat found in Croatian waters
Product of the Week: the LineGrabber
So-called 'Med Mooring' - handy in some anchorages, and here's how
Canadian storm bomb threat - sailors advised: get off the water!
Carbon monoxide poisoning - is it possible on YOUR boat?
Go crazy about whales in a special family fun day at the museum
Southport Yacht Club achieves Gold Anchor status   
Sailing family condemmed for taking 3-year-old on circumnavigation   
New contract-free plan for satellite communicator on your smart phone   
Melbourne Boat Show earlier this year - 12 to 16 June   
Southport Yacht Club will host a free 'Discover Sailing Day'   
Farmer sails his super-size pumpkin across lake - a New Zealand first   
Yacht of the Week: The Dashew creation: no sails, but eco-friendly   
No laughing! Sailing mistakes I don't want to make   
Destination: From Moscow Sea to the White Sea   
Land sailors of India on adventure across the Rann   
Future of Auckland's rescue helicopters in doubt   
A Paint App to (almost) replace your marine store assistant   
Amazing Whales – Evolution and survival opens tomorrow   
Maritime Alert - Dangerous conditions forecast for NSW boaters   
Club Marine Pittwater Sail Expo - Sea Guardian on display at RPAYC   
Hilary Lister and Nashwa Al Kindi set a new trans-ocean record   
How to anchor and 'never utter a word'   
Non-pyrotechnic flares for my boat - Can I or can't I?   
Health benefits of sailing   
Cruising in the Maldives - some nuts and bolts   


For this week's complete news stories select    Last 7 Days
   Search All News
For last month's complete news stories select    Last 30 Days
   Archive News







Sail-World.com  



















 
Our Advertisers are committed to our sport, please support them!
This site and its contents are © Copyright TetraMedia Pty. Ltd and/or the original author, photographer etc. All Rights Reserved.

Photographs are copyright by law. If you wish to use or buy a photograph you must contact the photographer directly (there is a hyperlink in most cases to their website, or do a Google search.) with your request.

Please do not contact Sail-World.com as we cannot give permission for use of other photographer’s images.

Only if the photographer named on the image is Sail-world.com, Powerboat-world.com, Marinebusiness-world.com or NZBoating-World.com.
Contact us .
Ph: +61 2 8006 1873 fax: +61 2 8076 0459 or complete our feedback form    Contact us .
   View our Privacy Policy.    [Go Home]     [  Banner Advertising Specification]    [Bot Archive ]

Customised news feeds -Marine Industry companies, Clubs and Associations have their own customised version of our news feed on their website.
Look_here_to_see_examples

X6XL NEW Cru SH