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What is the most accurate GPS device?
9-29-05 | delphinium

Posted on 09/29/2005 9:40:54 AM PDT by Delphinium

I know this is a personal matter but I am waiting for Garmin tech support to answer. I am wanting to buy a GPS device that is accurate atleast to 2 meters.

I know there are many high tech and high intellectual folks of Freerepublic, so I decided to ask.


TOPICS: Your Opinion/Questions
KEYWORDS: garmin; gotlostonwaytochat; gps
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1 posted on 09/29/2005 9:40:59 AM PDT by Delphinium
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To: Delphinium

The most accurate GPS device is an ex-wife...........


2 posted on 09/29/2005 9:42:56 AM PDT by Red Badger (In life, you don't get what you deserve. You get what you settle for...........)
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To: Delphinium
Two meters??

Ya gonna call in air strikes?

3 posted on 09/29/2005 9:44:07 AM PDT by porte des morts
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To: Red Badger

Got that right...they know where you're just thinking of going.


4 posted on 09/29/2005 9:44:15 AM PDT by stuartcr (Everything happens as God wants it to.....otherwise, things would be different.)
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To: Delphinium

If you buy a modern GPS receiver, the accuracy will have nothing at all to do with which one you use. GPS accuracy is a function of the physics involved with satellite positioning and the number of those satellites being tracked by your receiver. The more satellites it receives at once, the more accurate, up to a point. AFAIK, the best you get with GPS is about 15 ft (5 meters) accuracy.


5 posted on 09/29/2005 9:44:32 AM PDT by TChris ("The central issue is America's credibility and will to prevail" - Goh Chok Tong)
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To: Delphinium

Can you get your mitts on an unexploded JDAM?


6 posted on 09/29/2005 9:44:43 AM PDT by Redcloak (We'll raise up our glasses against evil forces singin' "whiskey for my men and beer for my horses!")
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To: Delphinium

Is this for a rack mount?


7 posted on 09/29/2005 9:45:07 AM PDT by stuartcr (Everything happens as God wants it to.....otherwise, things would be different.)
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To: Delphinium

My Garmin 182C with charting is usually showing accuracy at 8 feet. Sometimes it is 6 feet, sometimes at 9 ft. This is a 12 channel WAAS mounted unit on a 42 ft sailboat.


8 posted on 09/29/2005 9:45:08 AM PDT by Captain Jack Aubrey
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To: Delphinium

Garmin is an excellent manufacturer. If you want the ultimate accuracy and precision you need to go the route of base station and field station. Differential position can get down in the centimeter range.


9 posted on 09/29/2005 9:45:14 AM PDT by RightWhale (28 Sep 05 -- first snowflake --where's FEMA?)
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To: Delphinium

None are that accurate except differential devices like those used by surveyors, and you are talking $$$. WAAS capable units are the most accurate handheld and dash mount units you can get. The accuracy isn't really determined by the unit, but by the system.


10 posted on 09/29/2005 9:46:00 AM PDT by JustRight
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To: Redcloak

Ya beat me to it. Seriously thought I'd like to find a decent low-cost GPS too.


11 posted on 09/29/2005 9:46:12 AM PDT by F15Eagle (1st John 5:4-5, 1st John 4:15, John 11:25, John 14:6, 1st Timothy 2:5)
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To: stuartcr

And show up before you get there!.........


12 posted on 09/29/2005 9:46:25 AM PDT by Red Badger (In life, you don't get what you deserve. You get what you settle for...........)
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To: Redcloak

they are actually accurate to inches....but the government has a "wavy" signal so they are not perfect...and you can understand why...
I have a Medillian gold...color screen..and you can buy maps for all over the world..


13 posted on 09/29/2005 9:46:53 AM PDT by Youngman442002
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To: stuartcr

rack mount.........heh heh heh.........(Marine Corps pun).......


14 posted on 09/29/2005 9:47:19 AM PDT by Red Badger (In life, you don't get what you deserve. You get what you settle for...........)
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To: Delphinium
"...GPS device that is accurate atleast to 2 meters."

(G)allup (P)oll (S)urveys are never 'that' accurate...
15 posted on 09/29/2005 9:48:18 AM PDT by YouPosting2Me
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To: F15Eagle

Me too. I need the best lowww-priced GPS.


16 posted on 09/29/2005 9:48:29 AM PDT by CAWats (I don't have any confidence in my ability to fail - Kenneth Copeland)
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To: Delphinium
If accuracy is your thing, buy the smallest models of surveying GPS units with differential capability.
We're talking milimeters, then.
Kinematically (in motion), they are accurate to + or - 4 inches.
17 posted on 09/29/2005 9:48:59 AM PDT by Publius6961 (Liberal level playing field: If the Islamics win we are their slaves..if we win they are our equals.)
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To: JustRight

$$$ is correct. Surveyors do this, but the casual user would find it hard to justify the expense even if the base station is already in.


18 posted on 09/29/2005 9:49:04 AM PDT by RightWhale (28 Sep 05 -- first snowflake --where's FEMA?)
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To: F15Eagle

For hand held, I use a Magellan explorist 200. Works great and was less than $150.


19 posted on 09/29/2005 9:49:28 AM PDT by porte des morts
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To: Red Badger

Sorry, I was mostly Navy. I should have said 19" rack mount.


20 posted on 09/29/2005 9:49:29 AM PDT by stuartcr (Everything happens as God wants it to.....otherwise, things would be different.)
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To: F15Eagle

I hear the new Blackberry 8700, due to be released later this year, will have GPS on board.


21 posted on 09/29/2005 9:49:36 AM PDT by Solson (I've got eyes in the back of my head.)
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To: TChris
The more satellites it receives at once, the more accurate, up to a point. AFAIK, the best you get with GPS is about 15 ft (5 meters) accuracy

There are differences in accuracy, and differences in applications. A set designed for a fighter has to track more channels because things change rather quickly in a fighter aircraft. There are also differences in the algorithms implemented in various devices. The way they "track" the signal from the satellites varies. That mainly affects how well they maintain "lock" under low signal conditions, but it also affect accuracy. For the most precise uses, you have to go to differential. That takes an additional set located at a known point. There are also ways to get more accurate positions relative to some nearby point, without the extra set. Thus the position might be off by a meter or two, but relative to a post on the corner of your field or block, you might be good to centimeters.

22 posted on 09/29/2005 9:49:39 AM PDT by El Gato
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To: Delphinium

NavCom GPS


23 posted on 09/29/2005 9:49:51 AM PDT by Realism (Some believe that the facts-of-life are open to debate.....)
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To: Redcloak
I don't know much about current civilian GPS products but I do know that nowadays high-tech electronics from pc's to televisions and their accessories can become obsolete within a year and replaced on the market by more advanced, cheaper products. I would check out Wal-Mart unless you are a surveyor or a cartographer.
24 posted on 09/29/2005 9:50:18 AM PDT by Brad from Tennessee (Anything a politician gives you he has first stolen from you)
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To: porte des morts

thanks


25 posted on 09/29/2005 9:50:43 AM PDT by F15Eagle (1st John 5:4-5, 1st John 4:15, John 11:25, John 14:6, 1st Timothy 2:5)
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To: Delphinium

The one that flashes "You are here"


26 posted on 09/29/2005 9:51:06 AM PDT by john316 (JOSHUA 24:15 ...choose you this day whom ye will serve...)
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To: Red Badger

Ha ha, can't get away from her can you?


27 posted on 09/29/2005 9:51:27 AM PDT by Rebelbase (New Orleans rebuild by Mexican Labor will produce crawfish tacos and menuedo-gumbo.)
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To: Delphinium
Roughly speaking:

Recreational grade:

    10 meter accuracy $200

Mapping grade:

    1 meter accuracy $5000
    Sub-meter accuracy $10,000

Survey grade:

    0.1 meter accuracy $20,000

28 posted on 09/29/2005 9:51:32 AM PDT by SuperSonic (Don't just complain. Do something productive!)
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To: CAWats

Don't laugh. But check out Radio Shack.


29 posted on 09/29/2005 9:51:47 AM PDT by durasell
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To: TChris
If you buy a modern GPS receiver, the accuracy will have nothing at all to do with which one you use.

That will come as a surprise to us surveyors who have been using GPS for over 20 years with X/Y/Z accuracies of 1/4 inch.

30 posted on 09/29/2005 9:52:23 AM PDT by Publius6961 (Liberal level playing field: If the Islamics win we are their slaves..if we win they are our equals.)
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To: stuartcr

19"?..........heh heh heh.............Hey, sailor........


31 posted on 09/29/2005 9:52:39 AM PDT by Red Badger (In life, you don't get what you deserve. You get what you settle for...........)
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To: Delphinium

Related to this topic: Has anyone used a GPS to get a close estimate of the location of a tract of land? I own a remote 40 acre tract where I can identify one corner (survey marker) but due to steep hills the other 3 corners are difficult to identify.


32 posted on 09/29/2005 9:53:04 AM PDT by Senator_Blutarski (No good deed goes unpunished.)
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To: SuperSonic
Ex-Wife Grade:

Priceless!.......

33 posted on 09/29/2005 9:53:30 AM PDT by Red Badger (In life, you don't get what you deserve. You get what you settle for...........)
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To: Delphinium

A land surveyor I did some work for, swore by his Trimble unit, but it cost him about $15 grand, four years ago. Accurate to within an inch, when the government took off the dithering circuit it employs during heightened security.


34 posted on 09/29/2005 9:54:08 AM PDT by aShepard
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To: El Gato
For the most precise uses, you have to go to differential. That takes an additional set located at a known point.

OK, but that's not just GPS any more, is it?

35 posted on 09/29/2005 9:54:43 AM PDT by TChris ("The central issue is America's credibility and will to prevail" - Goh Chok Tong)
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To: durasell
Don't laugh. But check out Radio Shack.

I almost laughed. Almost.
36 posted on 09/29/2005 9:54:56 AM PDT by reagan_fanatic (Darwinism is a belief in the meaninglessness of existence - R. Kirk)
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To: Delphinium

I use a map and a compass. No batteries needed.


37 posted on 09/29/2005 9:55:34 AM PDT by Conspiracy Guy (Ponce de Leon is coming here to look for the fountain of dumb. The DNC is his first stop.)
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To: Captain Jack Aubrey

This is a 12 channel WAAS mounted unit on a 42 ft sailboat.
-----
The most accurate GPS service (code) available to the non-military user, will utilize a WAAS satellite for error correction information. If you need the ultimate, buy a good 12-channel system with WAAS capability.


38 posted on 09/29/2005 9:56:27 AM PDT by EagleUSA
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To: TChris
If you buy a modern GPS receiver, the accuracy will have nothing at all to do with which one you use. GPS accuracy is a function of the physics involved with satellite positioning and the number of those satellites being tracked by your receiver. The more satellites it receives at once, the more accurate, up to a point. AFAIK, the best you get with GPS is about 15 ft (5 meters) accuracy.

Good point, you may be able to get a little better if one of the "satellites" is actually a GPS transmitter on the ground near you with a location known preciscely. But maybe you can't provide that, so the above is about as good as it gets.

39 posted on 09/29/2005 9:56:40 AM PDT by KC_for_Freedom (Sailing the highways of America, and loving it.)
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To: Delphinium

Speaking as one who has used maps my whole life and have yet to use GPS, I can find a couple uses that I would consider getting one.

Boating navagation and tagging fishing holes and good hunting spots to return to.

I have heard that adjusters in Mississippi/La are using them to locate addresses as most of the street signs are gone.

What other uses do FReepers have for GPS?


40 posted on 09/29/2005 9:57:30 AM PDT by Rebelbase (New Orleans rebuild by Mexican Labor will produce crawfish tacos and menuedo-gumbo.)
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To: Publius6961
That will come as a surprise to us surveyors who have been using GPS for over 20 years with X/Y/Z accuracies of 1/4 inch.

Not with straight GPS they aren't. See a pretty detailed analysis of GPS accuracy both with and without WAAS suplemental signals here. Accuracy averaged 2-6 meters with WAAS.

41 posted on 09/29/2005 10:00:48 AM PDT by TChris ("The central issue is America's credibility and will to prevail" - Goh Chok Tong)
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To: Delphinium

What are you going to do with this? Make an entry into the Grand Challenge with your UGV?


42 posted on 09/29/2005 10:00:57 AM PDT by Wiz
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To: durasell
Not laughing. During the CB days of the 1970's, the Realistic brand of CB was kinda decent. Of course it was no match for a Cobra, but it was good for the money.
43 posted on 09/29/2005 10:01:43 AM PDT by CAWats (I don't have any confidence in my ability to fail - Kenneth Copeland)
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To: Rebelbase
I use mine while hunting. "CAR" is always my first waypoint. (Though I do have an eerie ability to find my way out of the boonies and right back to the point where I left the trail.)
44 posted on 09/29/2005 10:03:46 AM PDT by Redcloak (We'll raise up our glasses against evil forces singin' "whiskey for my men and beer for my horses!")
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To: Delphinium
I use a GPSr (receiver) for the hobby of geocaching. It is a hobby where you use a GPSr while hiking to find containers other people have hidden. Sort of like a high tech treasure hunt.
The cheapest consumer GPSr can be found for about $90 up to $500-600. The all are reliably accurate to about 30 ft (10 meters) although they can be more accurate depending on how many satellites you can see. The differences in price are memory, maps and driving directions available for the unit.
Magellans and Garmins are the main brands, both good. Stay away from Cobras though. Third party programs are available to load coordinates from map, etc.
45 posted on 09/29/2005 10:04:25 AM PDT by Wacka
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To: Rebelbase

Coordinating my drug drops and pickups.






Kidding...


46 posted on 09/29/2005 10:06:38 AM PDT by rollinginmybuggy (The Electric Amish)
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To: porte des morts
Ya gonna call in air strikes?

I was going to joke back "yes", but thought I better not kid about that kind of thing.

My husband needs one for use in mapping, helping him survey, etc.. atleast I think that is what he is doing. He has a program called earth google, and needs one compatible.

He is also an Idaho hunter.

this is the first time we have even looked into these devices.
47 posted on 09/29/2005 10:08:09 AM PDT by Delphinium
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To: TChris
"If you buy a modern GPS receiver, the accuracy will have nothing at all to do with which one you use."

This is not true with commercial GPS receivers. The more channels the receiver has, the greater the accuracy.

A Wide Area Augmentation System (WAAS) capable receiver will have better accuracy.

From Garmin (http://www.garmin.com/aboutGPS/waas.html):

"A WAAS-capable receiver can give you a position accuracy of better than three meters 95 percent of the time."

48 posted on 09/29/2005 10:08:41 AM PDT by magellan ( by)
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To: Delphinium
It doesn't matter how much you pay for a handheld.

I have tested several handheld models and found similar solutions among all of them. All were uniformly good performers, providing results that were better than the advertised specs (typically CE of 15-m). I got between 7-9 foot(!) accuracy.

All tests were conducted under no cover and in ideal conditions (but with no WAAS!)

The study used 980 points, with 10 different recievers, including:
Trimble geoexplorer III
Garmin GPS60, eTrex, iQue3600
Lorance globalmap 100, iFinder Pro

All of these are handhelds and nothing I say is about survey-grade (second signal carrier phase, long set-ups and triangulation which can get you to sub-centimeter precision, but cost $10s of thousands) operation.

49 posted on 09/29/2005 10:09:16 AM PDT by kinsman redeemer (the real enemy seeks to devour what is good)
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To: stuartcr

It should be a hand held, for mapping out property.


50 posted on 09/29/2005 10:09:42 AM PDT by Delphinium
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