Navigating with GPS and other means? - Page 2 - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > General Interest > General Discussion (sailing related)
 Not a Member? 


Reply
 
LinkBack Thread Tools
  #11  
Old 01-14-2011
Boasun's Avatar
Senior Member
 
Join Date: Feb 2007
Location: New Orleans, LA
Posts: 3,054
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
Boasun will become famous soon enough Boasun will become famous soon enough
Quote:
Originally Posted by Boasun View Post
The satellites will not be falling out of the sky, they are 11000 miles above the earth. But a major solar flare, a large dither put back in by the military, or jamming by those are enemies or those who think of it is a practical joke. Certain electronic equipement have jammed ship board GPS's.
Plus you may have not plugged in the correct chart datum. Or position the GPS antenna in the optimum position on your vessel. Bad antenna connection have caused one cruise ship to run aground. And I've had three GPS's go belly up on me, which is a good reason to have all of your way points listed in your Navigation work book AND use secondary means of Navigation to confirm your position.
The above is excellent reasons to practice Coastal piloting and maybe Celestial.
__________________
1600 Ton Master, 2nd Mate Unlimited Tonnage

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Maritime Instructor
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

S/V Rapture
Reply With Quote Share with Facebook
  #12  
Old 01-14-2011
Senior Member
 
Join Date: Jan 2008
Posts: 287
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 7
genieskip is on a distinguished road
I use anything and everything I can. I have two chartplotters aboard, one at the helm and one at the chart table (and they are totally independent of each other). I always carry paper charts and I have radar and a decent hand bearing compass and , of course, a depthfinder. I haven't taken a sextant reading in over thirty years and would take along time to relearn the stuff I was taught as a midshipman half a century ago, though I guess they have little handheld calculators now that do most of the work for you and I have heard that you can get programs for a laptop to do the same. I haven't gotten that far yet. I don't carry a laptop because I haven't figured out the software, though that's lurking in the back of my mind (and anyway I'm a Mac person and most of the programs are for the laptops running evil empire software)
__________________
genieskip
Northeast
J40
1991
Reply With Quote Share with Facebook
  #13  
Old 01-14-2011
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 9 Times in 9 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
Genieskip—

If you're looking for a nav program for the Mac, look at MacENC, which can use the free NOAA ENC charts.
__________________
Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
Reply With Quote Share with Facebook
  #14  
Old 01-14-2011
AdamLein's Avatar
Senior Member
 
Join Date: Nov 2007
Location: Coquitlam, BC
Posts: 1,866
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 7
AdamLein will become famous soon enough
Like many folks here I like the ETA and VMG functions of my GPS and that's mainly what I use it for. In terms of actually deciding which way to steer, I do it all by eye. My GPS doesn't have maps on it and I only carry paper charts. I sometimes transfer my position from the GPS, but generally I'm either far enough from the nearest hazard that I don't care precisely where I am, or I'm close enough to it that my main navigational tool is the depthsounder.
__________________
s/v Essorant
1972 Catalina 27
Reply With Quote Share with Facebook
  #15  
Old 01-15-2011
centaursailor's Avatar
Senior in age only!!!
 
Join Date: Nov 2010
Location: Balbriggan
Posts: 554
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 4
centaursailor is on a distinguished road
Smile

Been using GPS driven chart software on my laptop for 7 years now.
Its reliable enough but only the foolish would take anything for granted when on the water, all circumspect sailors should use at least two independent position fixes systems, as well as their eyes and ears, because instruments alone are the path to certain disaster
There,s a sad story about Jean Socrates who was within a few hours of completing a circumnavigation and ran aground because of, as i understand it, instrument failure. She out again and is some were near the Beagle Channel so it didn,t put her off. Not suggesting she was in any way responsible but the story indicated her boat was on autopilot at the time and she was resting below.
Happy sailing
Brian
__________________
The great appear great because you are on your knees. James Larkin, Irish Labour Movement.
Reply With Quote Share with Facebook
  #16  
Old 01-15-2011
Junior Member
 
Join Date: Apr 2010
Posts: 27
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
skippertips is on a distinguished road
For the most part--I've seen appalling laziness by captains, both pro and recreational when it comes to backing up the black-box navigation devices. Having crewed on three offshore deliveries this past year, only myself and one other crewmember maintained a plot along with a running navigation log.

As a professional maritime instructor, former director of navigation and seamanship, and veteran Coastie navigator, I cannot emphasize enough the importance of basic navigation as a backup.

I'm not talking popping off sunlines every hour. I'm talking entering or leaving a harbor, making landfall, navigating through islands, making positive identification on aids to navigation or islands to the right, left and ahead.

One captain was using a 1:500,000 scale chart to thread his way through islands. I am always quite pointed about asking a captain if he or she carries and uses nautical charts aboard for piloting waters. The usual answer is "of course!". But once you're out there, it rarely if ever happens.

It's easy to get complacent in your own area of operation. But I tend to believe otherwise. For example...Let's say you're motoring down a busy, narrow channel 50 yards wide. Shoals to the left and right. Some pockets of good water between the shoals. Your engine dies. You need to get out of the channel fast and drop the hook. Which way do you turn? Left? Right?

On your nautical chart, deep-water pockets between the shoals are shown as blobs of white with clearly marked soundings. Good luck trying to find those same areas, with depths clearly shown on any chart plotter!

Enter the strip chart (or a folded nautical chart, or a printed copy of a nautical chart), properly annotated with these areas marked. Pop it on a clipboard with a rubber band and throw it down in a corner of the cockpit. See what I mean? That's easy. Dead simple.

And that's what I have taught and written about for years in small boat navigation or sailing navigation. I believe that in order to convince people to navigate, you have to give them something simple, practical, and something that will work short handed or single handed.

But most important--you have to set the example and practice it yourself, in front of others. That's where captains and skippers really have the responsibility to set an example. Anyone crewing with you will be influenced by how you do things aboard your boat.

Captain John
skippertips.com

Last edited by skippertips; 01-15-2011 at 09:37 AM.
Reply With Quote Share with Facebook
  #17  
Old 01-15-2011
jackdale's Avatar
Senior Member
 
Join Date: Dec 2008
Location: Calgary, AB, Canada
Posts: 8,739
Thanks: 25
Thanked 30 Times in 27 Posts
Rep Power: 6
jackdale will become famous soon enough
skippertips et al

+1

I also have my students go through a lengthy planning process in which they identify all of the aids to navigation that they expect to encounter with: an bearing on first sight, side to leave-to, location, light characteristics, etc.. We also have a couple of options for passes we need to transit with the safe times to go through, danger / clearing bearings noted, hazards identified,etc.

We do maintain a decklog with position, course speed, meteorological conditions etc..
__________________
__________________
ISPA Yachtmaster Offshore Instructor Evaluator
Sail Canada Advanced Cruising Instructor
IYT Yachtmaster Coastal Instructor
As I sail, I praise God, and care not. (Luke Foxe)
Reply With Quote Share with Facebook
  #18  
Old 01-15-2011
jackdale's Avatar
Senior Member
 
Join Date: Dec 2008
Location: Calgary, AB, Canada
Posts: 8,739
Thanks: 25
Thanked 30 Times in 27 Posts
Rep Power: 6
jackdale will become famous soon enough
Slight aside

This web site has a great outline for passage planning. While it is meant for the big guys, recreational boaters can benefit from the process as well.

Ship Passage Planning
__________________
__________________
ISPA Yachtmaster Offshore Instructor Evaluator
Sail Canada Advanced Cruising Instructor
IYT Yachtmaster Coastal Instructor
As I sail, I praise God, and care not. (Luke Foxe)
Reply With Quote Share with Facebook
  #19  
Old 01-15-2011
HDChopper's Avatar
Needing Apehanger Helm
 
Join Date: Oct 2010
Location: AZ
Posts: 495
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 4
HDChopper is on a distinguished road
Thanks again jackdale
For now on I gonna follow you around scarfing up links lol ....
__________________
There is no right way to do the wrong thing
Reply With Quote Share with Facebook
  #20  
Old 01-15-2011
jrd22's Avatar
Courtney the Dancer
 
Join Date: Nov 2000
Location: San Juan Islands., WA, USA
Posts: 3,805
Thanks: 3
Thanked 14 Times in 14 Posts
Rep Power: 14
jrd22 will become famous soon enough
I use the chartplotters for determining headings and then usually use the compass while checking the plotters for cross track error. The depth sounder is the most important instrument on board though. In poor visibility or heavy traffic radar is what I'm looking at. Paper charts and Coast Pilot and usually a variety of cruising guides are always out and referenced.
__________________
John
SV Laurie Anne

1988 Brewer 40 Pilothouse

Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Circumnavigation navigating...... Minnewaska General Discussion (sailing related) 20 10-29-2010 05:10 PM
Tell us what your username means Moonfish General Discussion (sailing related) 90 03-11-2009 09:41 PM
Navigating with an iPhone? PaulSail51 General Discussion (sailing related) 42 11-27-2008 12:12 PM
navigating a squall bkw Learning to Sail 53 03-08-2008 04:25 PM
Navigating with Radar Jim Sexton Seamanship Articles 0 03-29-2002 07:00 PM


All times are GMT -4. The time now is 02:02 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012