GPS is not yours! - 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
  #1  
Old 07-03-2006
Junior Member
 
Join Date: Jul 2006
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
aberchrisxx is on a distinguished road
Exclamation GPS is not yours!

I posted this elsewhere, but the information deserves its own thread.

I know little of offshore boating, and almost nothing about sailing. What I do know a lot about is GPS. With a Dad that works for NASA in Florida, and an Aunt who literaly wrote the manual for the first GPS reciver in the 80's for ground infantry in the army, I come from a family in the know. I wrote a college thesis on GPS technology as well.

The most imporatant thing to remmember is that GPS is made up of two seperate components, the reciever, and the Transmitter. You have complete control over the reciever. You can buy recievers that are almost indestructable, water proof, and I would say much more reliable than a sextant.

But the reciever is only half of what is required to use GPS. Almost everyone in the United States relies on the Department of Defenses NAVSAT Array, a series of 24 satalites that your recevier uses to triangulate a position. The Russians have an incomplete array, and the EU is planning to put up an array, GLOBAL something or other.

First and formost thouse satalites are for the deffense of this nation, and will, and have been used as such! The military did not release the full potentional of the GPS system untill Clinton told them to unscramble the signal in 2000 (then called Selective Avalablity) And they withold the ability to rescramble and even stop the signal for use by the military if they need it.

For example, in the Iraq war they would move as many of the NAVSAT sattlites as possible over Iraq (up to 7 of the 24), then program them to compensate for weather affecting the signal, and this is just what has been declassified! Do you think a civilian GPS recevier worked anywhere near Iraq during the first months of the war?

And this is just what the Department of Defense can do to the signal, what about solar interference that can make gapping holes in satilite coverage, or space trash destorying satilites? God forbid your the only one relying on GPS for navigation when the military moves a sattlite from over the south pacific to fill a hole in thier covarage elsewhere.

Dont take GPS for granted, its not yours! Only the reciver in your pocket is yours. On the other hand, a sextant is yours, you have control over it. You can drop it on the deck, but at least you will know why it doesnt work!
Reply With Quote Quick reply to this message Share with Facebook
  #2  
Old 07-03-2006
Valiente's Avatar
Senior Member
 
Join Date: Jun 2006
Location: Toronto
Posts: 5,491
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
Valiente has a spectacular aura about Valiente has a spectacular aura about
What's your point? I own a Astra IIIB and a Freiberger...this isn't exactly news. Of course, I suppose the fact that your armed forces supported entirely by taxes can devise systems that "aren't yours" may be.

As far as I'm concerned, GPS is a Darwinian test to remove idiot sailors from the gene pool. In that sense, it works splendidly.

And the European GPS array is called "Galileo".
Reply With Quote Quick reply to this message Share with Facebook
  #3  
Old 07-03-2006
Junior Member
 
Join Date: Jul 2006
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
aberchrisxx is on a distinguished road
GPS is a great technology, up there with the computer and automobile in modern tech. But a lot of people dont relize what can go wrong with it, I relize nothing is without a negative side but people shouldnt put down celestual navigation and other ways of nagivation saying that GPS is fool proof when it is not. And you dont own the GPS sattlites anymore than you can hop in an M1 abrams tank and drive it away, great your taxes pay for it, you know what I mean.
Reply With Quote Quick reply to this message Share with Facebook
  #4  
Old 07-03-2006
Senior Member
 
Join Date: Dec 2002
Posts: 552
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 13
GordMay is on a distinguished road
I am shocked and dismayed to hear that aberchrisxx suspects that the U.S. (or any) government is not as reliable a source of data as are the heavenly bodies (over which we have NO control).
Upon reconsideration, maybe not so shocked ...
Reply With Quote Quick reply to this message Share with Facebook
  #5  
Old 07-03-2006
Senior Member
 
Join Date: Jun 2004
Location: Malaysia
Posts: 314
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 11
haffiman37 is on a distinguished road
Then perhaps 'someone' should vote a 'new' Clinton back in the White House and send mr. Bush to Irak with a sextant?
Reply With Quote Quick reply to this message Share with Facebook
  #6  
Old 07-05-2006
Baysailor3's Avatar
Junior Member
 
Join Date: Jul 2006
Location: Northern Virginia area
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Baysailor3 is on a distinguished road
I sail on the Chesapeake Bay and tribs, and a GPS is a nice luxury to have, however, most of our navigation comes from a chart and a pair of binoculars. The GPS certainly can motivate kids to help you navigate, they think it is a "Gameboy" for sailing! LMAO...
Reply With Quote Quick reply to this message Share with Facebook
  #7  
Old 07-05-2006
Surfesq's Avatar
Senior Member
 
Join Date: May 2006
Location: Chesapeake Bay, MD
Posts: 1,245
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
Surfesq is on a distinguished road
Whoa! Slow down boys....change your shorts and pay attention. GPS was available before Clinton declassified the signal that allows for the current accuracy. GPS is now accepted as the standard for navigation and that is not going to change. In fact, the US Naval Academy no longer teaches celestial navigation because it is just too imprecise. I have sailed to Bermuda with just a Sextant for navigation three times....You can keep it.
Look, if we get to the point where the government classifies GPS all together we will probably be worrying about finding a bunker rather than a beach!
Reply With Quote Quick reply to this message Share with Facebook
  #8  
Old 07-05-2006
Surfesq's Avatar
Senior Member
 
Join Date: May 2006
Location: Chesapeake Bay, MD
Posts: 1,245
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
Surfesq is on a distinguished road
By the way, Haffiman: It's good to know you libs are so well educated. It's spelled Iraq! lol.
Reply With Quote Quick reply to this message Share with Facebook
  #9  
Old 07-06-2006
Omatako's Avatar
Senior Member
 
Join Date: Sep 2003
Location: Auckland New Zealand
Posts: 2,449
Thanks: 0
Thanked 30 Times in 27 Posts
Rep Power: 12
Omatako will become famous soon enough
We're not the only GPS users

Whilst not being an expert on airline navigation I have an understanding that they rely almost exclusively on GPS. It would be real interesting to see what would happen to 5000 airliners and their 150000 passengers when the US government decides to "switch it off".
I reckon as long as there is a small country's worth of people in the sky depending on GPS, I'll be reasonably safe with it on my boat.
But then again, maybe I'm completely wrong, perhaps the airlines still use sextants?
Reply With Quote Quick reply to this message Share with Facebook
  #10  
Old 07-06-2006
Member
 
Join Date: Jun 2006
Posts: 80
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
infonote is on a distinguished road
GPS is not 100% accurate. The military intentionally made it a couple of meters inaccurate, so it cannot be used for example in missiles.

You can measure accuracy of your receiver:

http://www.edu-observatory.org/gps/gps_accuracy.html
Reply With Quote Quick reply to this message Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




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
cheap GPS tadd16 Gear & Maintenance 8 07-02-2006 01:21 PM
GPS rbh1515 Gear & Maintenance 8 06-14-2001 01:27 PM
GPS rbh1515 Gear & Maintenance 2 04-02-2001 07:30 PM
GPS wiring JeffreyG Gear & Maintenance 2 03-23-2001 02:26 PM
GPS III vs Standard H 150 chartplotter sanuk Gear & Maintenance 1 03-21-2001 10:44 AM


All times are GMT -4. The time now is 01:48 AM.

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

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.