Author Topic: GPS - Trust / Don't Trust  (Read 26089 times)

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Offline Rider Pride

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Re: GPS - Trust / Don't Trust
« Reply #50 on: September 12, 2010, 12:30:22 »
If that's where you think the quote originated from, I'll let you run with that thought.
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Re: GPS - Trust / Don't Trust
« Reply #51 on: September 12, 2010, 13:08:17 »
If that's where you think the quote originated from, I'll let you run with that thought.

Not originated, just made popular.
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Re: GPS - Trust / Don't Trust
« Reply #52 on: September 12, 2010, 13:34:50 »
While I gave thick brush or jungle as an example of complex terrain, i of course didn't mean those are the only types of conditions that can attenuate the signal.
The point I'm getting at is, as good as GPS is, and I agree it is an incredibly useful instrument, users need to understand its limitations

The GPS can be tracking only 3 satellites, and while this will give a very useful approximate fixation, this might continue for some time until it picks up a fourth satelite. During that time there can be some drift. Should the GPS be coupled to navigation system, and if the user had entered a location into the nav aid earlier that was not that accurate, then it is possible the nav aid will try to incorporate that difference from where it thought it was to what the user put in, exacerbating the situation.

Since GPS relies on its latitude for its direction, having a grid that is somewhat skewed can degrade any bearings displayed, though for most navigation purposes its not that noticeable.

But these things combined (bad fix and orientation) can become very noticeable if for example lasing a tgt using a system that relies on inertial/GPS navigation (and why devices like PSS SOF can help resolve them)

Another reason I believe map and compass training is vital, is from a human factors point of view. The DAGR currently in use, when used alone,  has the draw back of displaying primarily just a location, altitude, and direction/heading, whereas most civilian applications use a more effective rolling map type of display to convey surrounding information. I think for that reason alone, sound knowledge on how to use a map helps a great deal in maintaining situational awareness.

Offline KellGunner

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Re: GPS - Trust / Don't Trust
« Reply #53 on: September 28, 2010, 14:34:52 »
i have a few things to say about GPS, speaking as a DAGR (new army GPS we got a few years ago)

IT DOES NOT REPLACE PROPER NAVIGATIONAL TRAINING

That being said, GPS is a wonderful tool as long as it works.  There are a few things someone does need to worry or watch.  Do they know how to operate the GPS properly? If not they should not play around with it too much.  Are you in a situation where spoofing could apply?  If so i would not use it, just so people know spoofing is when someone is messing with your GPS signal, it will say your somewhere but in reality your somewhere else.  This apparently happened to the Israelis when they went into Lebanon in 2006.  Did not end well for the Israelis.

As well i hope people in the field are seriously not totally relying on GPS as there are times when its accuracy is less than ideal (ive seen the old PLGR with a 150km variance, I was not impressed)

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Re: GPS - Trust / Don't Trust
« Reply #54 on: September 28, 2010, 14:53:02 »
i have a few things to say about GPS, speaking as a DAGR (new army GPS we got a few years ago)

IT DOES NOT REPLACE PROPER NAVIGATIONAL TRAINING

That being said, GPS is a wonderful tool as long as it works.  There are a few things someone does need to worry or watch.  Do they know how to operate the GPS properly? If not they should not play around with it too much.  Are you in a situation where spoofing could apply?  If so i would not use it, just so people know spoofing is when someone is messing with your GPS signal, it will say your somewhere but in reality your somewhere else.  This apparently happened to the Israelis when they went into Lebanon in 2006.  Did not end well for the Israelis.

As well i hope people in the field are seriously not totally relying on GPS as there are times when its accuracy is less than ideal (ive seen the old PLGR with a 150km variance, I was not impressed)

Pretty sure you've just reiterated what has been said in the last three pages.

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Offline mariomike

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Re: GPS - Trust / Don't Trust
« Reply #55 on: May 13, 2016, 15:40:52 »
May 13, 2016

Kitchener woman follows car's GPS directions into Lake Huron, swims to shore
http://www.680news.com/2016/05/13/kitchener-woman-follows-cars-gps-directions-lake-huron-swims-shore/
Police say following the instructions from a GPS on a foggy night left an Ontario woman taking an unplanned swim in Lake Huron.

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Re: GPS - Trust / Don't Trust
« Reply #56 on: May 13, 2016, 15:50:52 »
During my Co-op with the Pan Am / Parapan Am games, I would have been lost without GPS.
I bought a new smart phone, ensured it had a high data plan and current updates.

I had no problems where I was going. Some places were off road, but attention to detail solved
those challenges.
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Offline NavyPhoenix

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Re: GPS - Trust / Don't Trust
« Reply #57 on: May 13, 2016, 15:52:45 »
Just bought the Garmin U2Nav. Useless. The streets have no names and I still haven't found what I am looking for.

Offline Lumber

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Re: GPS - Trust / Don't Trust
« Reply #58 on: May 13, 2016, 16:00:39 »
Just bought the Garmin U2Nav. Useless. The streets have no names and I still haven't found what I am looking for.

Maybe you're not at the right elevation?

:rofl:
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Re: GPS - Trust / Don't Trust
« Reply #59 on: May 13, 2016, 16:07:25 »
Just bought the Garmin U2Nav. Useless. The streets have no names and I still haven't found what I am looking for.

Does your GPS play this ?  U2 song - https://www.youtube.com/watch?v=4qairkoPEUQ    [:D
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Offline ArmyVern

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Re: GPS - Trust / Don't Trust
« Reply #60 on: May 13, 2016, 16:23:40 »
If there's no line on the horizon, he's probably in the heartland on Cedarwood Road.
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Re: GPS - Trust / Don't Trust
« Reply #61 on: August 05, 2016, 09:15:57 »
Aug 5, 2016

Avenue Rd. and St. Clair Ave. W.,

Tourist follows GPS onto St. Clair streetcar tracks, slams into pole
http://www.680news.com/2016/08/05/tourist-follows-gps-onto-st-clair-streetcar-tracks-slams-into-pole/
A man from out of town was in a rental car en route to the airport and instead of turning onto the street, he followed his GPS right onto the streetcar tracks, slamming into a pole holding up TTC wires.



Offline dapaterson

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Re: GPS - Trust / Don't Trust
« Reply #62 on: October 01, 2017, 15:09:37 »
Allegations that Russia is spoofing GPS in the Black Sea: https://www.wired.co.uk/article/black-sea-ship-hacking-russia
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