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Old 26-07-2014, 08:55   #31
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Re: What will Happen to you when GPS goes Down

I don't see the problem, 99% of the sailing is coastal cruising and a chart plus a set of eyes and you are good to go. The very few who are offshore can hit a continent by simply following a compass course.
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Old 26-07-2014, 08:59   #32
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Re: What will happen to you when gps goes down

Quote:
Originally Posted by d design View Post

(...)

I know how to build a gps jammer that I can use on a vessel to make it appear in a different location or shut it down all together.

(...)
I know how to place a spanner next to a compass.

Now what?

Why jam your own gps?

You are talking nuts, mate.

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Old 26-07-2014, 10:21   #33
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Re: What will Happen to you when GPS goes Down

I think he was trying to say that if HE could jam it, any idiot could build one......

or did I get that wrong
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Old 26-07-2014, 11:29   #34
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Re: What will Happen to you when GPS goes Down

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Originally Posted by d design View Post
How many people here even know how to get simple 3 point fix? I see so many computer geeks here talking about their Ipads and Iphones and crap.
If the system goes down I have a sextant, HO249 tables, a crystal-controlled clock, a stop watch, paper, and pencils.

I have a compass. I can see the sun and stars. It's pretty hard to miss a continent. I'll find my way somewhere.

The depth sounder will still work (absent failure or a lightning strike) and that helps tremendously.

Quote:
Originally Posted by atoll View Post
you could hold up your am radio,and tune into a local radio station,then turn it till you find the "null" point direction then sail down that bearing.
Darn tooting. Assuming land-based AM radio is still running and you can figure out where the signal you are DFing is coming from. Any portable radio with a carbon antenna will work pretty well.

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Originally Posted by StuM View Post
And it's also not much good out of sight of land. It's only good for pilotage.
Not true at all. During grayline propagation you can get many hundreds of miles - that dusk and dawn every day.
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Old 26-07-2014, 12:08   #35
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Re: What will Happen to you when GPS goes Down

Lol.. Right now most of us have chart plotters that can use either or both of GPS or GLONASS (Russian). In the next few years that will extend to the BNS (China) and Galileo (EU). In total they would equate to something like 200 positioning sattelites. There isn't a country today that could shoot down all of them at once including the US.

It might be possible to take down one of the four systems, but why bother? Any chart plotter in the world will be able to use all four systems in combination soon.

Frankly the only likely way to loose positioning function would be from a massive solar flare. Which would also likely melt all the electronics on the boat, including stop watches, timers, and the batteries. So unless you are sailing around with a wind up stop watch none of it matters anyway.

If something like this happens you sail towards a big land mass, and figure out what to do from there.
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Old 26-07-2014, 12:57   #36
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Re: What will Happen to you when GPS goes Down

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If something like this happens you sail towards a big land mass, and figure out what to do from there.
Or in our case, away from one.
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Old 26-07-2014, 13:00   #37
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Re: What will Happen to you when GPS goes Down

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If something like this happens you sail towards a big land mass, and figure out what to do from there.
Follow someone in who has a deeper draft. Its not stupid. Might have to be prepared to wait out at sea for a day of two and get in a bit closer as each larger vessel heads in.

I do that going into shallow chanels now, if I get a chance. If theres a local behind me I let them pass so he can show me the way
I did that down the ICW in the USA a lot, giving them a nice wave after they grounded and I could steam past. Two fingers is a nice wave to an Aussie


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Old 26-07-2014, 13:32   #38
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Re: What will Happen to you when GPS goes Down

What happens if the internet goes down, and one can't read CF?
That would be a maritime disaster.
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Old 26-07-2014, 13:38   #39
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Re: What will Happen to you when GPS goes Down

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What happens if the internet goes down, and one can't read CF?
That would be a maritime disaster.
jeeeze! that would be like going out for a long sail with no smart phone or sat comms.....harsh
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Old 26-07-2014, 13:50   #40
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Re: What will Happen to you when GPS goes Down

[QUOTE=Adelie;

And then there is the solar storm of 1859 which caused aurorae as far south as Hawai'i and damage to telegraph systems around the world. Such an event now would damage power systems around the world and damage or destroy a significant percentage of satellites currently in orbit. While it was a 500 yr event and was 165yr ago, that doesn't mean we have 300-odd years to the next one, that means the average interval is 500yr, we could have another one like that tomorrow.[/QUOTE]

I love it when somebody is kind to you guys, understates a problem and you all go about like this world is going to last forever "as is" and ignoring the problem. The Carrington Event showed the northern lights as far as Cuba. All wired devices at that time sparked and became inoperable. And it lasted for days. So your just going to pull out your next GPS? Or point your antenna to a radio source? What are you going to do when all your rigging lights up? (I guess you won't need nav lights!)
And before you think this wouldn't dare happen in our day, A Carrington Event narrowly missed the earth in 2012, with scientists revising their guesses- saying that the next ten years we have a 10% chance of us getting hit by another one. My bet is when one does hit, and knock us temporarily (or long term) back to the stone age, that they will revise their guess once again.
BTW- I bet an event that size will destroy our ability to use compasses, at least temporarily. That ought to get you to thinking. An extreme electromagnetic storm could do a lot more than disable our toys.
Guess I'm keeping my DR stuff around. Just the Luddite in me I guess.
Solar storm of 1859 - Wikipedia, the free encyclopedia
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Old 26-07-2014, 14:17   #41
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Re: What will Happen to you when GPS goes Down

90% of the stuff you worry about never happens. Of the 10% that's' left over, you can't do anything about half of it. So you really only need to worry about 5% of the total.

"Don't believe everything you read on the internet".
(Abraham Lincoln)
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Old 26-07-2014, 14:59   #42
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Re: What will Happen to you when GPS goes Down

Mark, put your shirt (and shorts) back on and stop showing off. The old Soviet trick of letting the recruits show you where the mines are is supposed to be secret. Forward comrades! (Booom!). Also, don't let it be known you have the only decent beer between the Atlantic and Pacific Oceans, or you'll have visitors.
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Old 26-07-2014, 15:28   #43
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Re: What will Happen to you when GPS goes Down

Whip out the almanac and sextant, like at every lunchtime?
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Old 26-07-2014, 15:33   #44
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Re: What will happen to you when gps goes down

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I know how to build a gps jammer that I can use on a vessel to make it appear in a different location or shut it down all together.
A GPS doesn't track you - you do understand that don't you, its not a transmitter, only a receiver. And the only information it receives is is the time signal from individual satellites.
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Old 26-07-2014, 15:40   #45
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Re: What will Happen to you when GPS goes Down

About the am radio and null.

This is new to me, but it makes sense ... to a point.

I would think one would have to know the ferret(I forget how to spell it) antenna's orientation.

What kink of antenna is in those really ... really small am radios?
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