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post #1 of 14 Old 09-23-2008, 11:59 AM Thread Starter
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Question GPS question

A group of us went on a trip to Silver City, NM just recently. Three of us had a GPS hooked up during the trip. Not one of the systems were correct in it's navigation once we got to Silver City. Everything we tried to find using a GPS sent us way off course. I had never had that happen before. Usually the system is dead on. Has anyone had this same problem while traveling around the country?

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post #2 of 14 Old 09-23-2008, 12:06 PM
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When you say that not one of them was correct, how do you mean?....didnt take you to the correct location, or each one had their own, but different route to the location?

I have a TTR2 on my Wee, and my pal has a Zumo 450. Very often they choose different routes, but the destination is the same.

Just curious.

Cheers,

ps: has there been alot of UFO activity in that area lately?.....jk

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post #3 of 14 Old 09-23-2008, 02:56 PM
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My Garmin 2730 is usually pretty good. But on a trip back in May with a buddy who has a TTR (maybe an R2) we ended up in one town (I think it was Pioche, NV) that had one gas station, the location for which the GPSs agreed. Each of us had a different route to the station (we followed his). And both of us ended up sitting at an intersection staring at the place where there was supposed to be a gas station that didn't exist. Didn't even look like it used to be a gas station. Eventually, we did locate the station a couple blocks away.

On the trip, we also found the problems of not having updated maps. Neither GPS showed gas stations in Hanksville or Green River. Fortunately I had my laptop so we were able to google the locations that really did exist before we left the motel on those days. I've since gotten the map updates and both towns now show appropriate locations.

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post #4 of 14 Old 09-23-2008, 05:28 PM
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I suspect that the previous comments regarding older maps are the cause.

Having said that, GPS depends on satellite reception and the signal from these satelites can be changed and/or interferred with.

I also fly ultralight aircraft up here in Canada. We are required to check Notams (Notice to Airmen) in our flight area for messages relating to flying.. areas to avoid, changes in towers, military activity, etc. I think it was the summer of 2006 that there was a Notam saying that GPS signals around the Ottawa, Ontario area (Canada's capital) would be unreliable and/or none-existent for a given day or two. Evidently the Government was checking the ability to interfere with these signals, to make them incorrect, and to blank them out altogether.

I doubt a similar situation is the cause of your difficulties but I thought it was interesting to keep in mind.

..Tom

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post #5 of 14 Old 09-23-2008, 05:37 PM
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post #6 of 14 Old 09-23-2008, 10:05 PM
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So how close is Silver City to Roswell or Area 51?

You never know... :conehead:

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post #7 of 14 Old 09-24-2008, 11:22 AM
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I have found that POI's can indeed be off by as much as 4 city blocks. When I find this, I correct it on my TTR2, and next time I connect to the puter, it sends that info to TT.

Some cities (like Calgary) change/add new streets, overpasses, off-ramps so often, it is very difficult to have a map that is going to be spot on everytime.

Generally, you are connected to more than 4 satellites, infact, mine is usually connected to as many as 11.

Cheers

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post #8 of 14 Old 09-24-2008, 01:26 PM
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I've never had any of my 5 GPS show my destination other than where it was supposed to be - as V-Tom says - maps may be one variable although I have a couple of times run into the right civic address and location, but on the wrong street (due to renaming - again related to how recent the maps.).

Discrepancy beween GPS is common - most have option settings for how routes are calculated, vehicle type, Toll roads, no U-turns etc., secondary roads. and if you are set to auto-recaclulate - it's just amazing sometimes where that little gizmo will want you to go, based on it's options settings and map / street acuracy - including details of one-way streets. All of these factors have to be taken into account at times, or else the options changed to reflect what you as the driver are willing to sustain.

Safe rides
Bob

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post #9 of 14 Old 09-25-2008, 04:00 AM
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None of them worked! ??
Did you all check your watches to see if there was any unexplained laps in time?
Anyone have a foggy memory of laying on a cold metal table with strange subjects with big eyes and tiny mouths looking down at them?

LOL :rolleyes:

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post #10 of 14 Old 09-28-2008, 06:32 PM Thread Starter
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We all had the latest updates on each GPS, there were three in the group. Not one of the systems took us to the location we were looking for. This is a old city and the places we were trying to find were never correct. The attractions, restaurants, gas stations, hotels all wrong. It baffled us how far off they were.

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