WHY (the gps send me in a very wrong road)

The new map set is 2015.10. Maybe this update will solve your issue.

Could be your settings!

Shortest route?
Fastest route?
Avoidances setting?

Make sure avoid toll roads is turned off in settings.

Or just occasionally?

http://money.msn.com/auto-insurance/can-you-blame-your-gps

Key line from the article: "The systems are ubiquitous, but they're not foolproof..."

I've had this happen occasionally when going to a restaurant. Sometimes the address will have been obtained from an "owners database" and not be the address of the actual location.

I've often wished the GPS would use a combo of fastest and shortest route. I take a trip a few times a year that gets a little tricky at points since I don't do it often enough but I basically know the way now.

I use the fastest roads for a portion then switch to a more direct route. This combo shaves 50 miles and a half hour off of the route believe it or not.

Yes! Sometimes the shortest route is quite stupid, like taking exits, waiting for signals and immediately reentering the same freeway.

May be the shortest, but not the fastest

If this is a trip that you take often, why not create your own route? That's what I have done for some of my less frequent trips.

It's weird sometimes what Garmin routing does.

And sometimes I have different Garmin models give me differing routes.

I wish the Garmin had an option to route avoiding red light cameras.

That would drive you insane in a city like Chicago that has hundreds of RLC's. I'd bet there would be some areas that would be completely inaccessible because of the density of RLC's.

That'd be cool for areas with only a few RLC's, and you could turn it off for places like Chicago. Or you could turn it on for laughs and see just how bad the route would get. The question is could they implement it for an aftermarket (poi-factory) RLC file or would it have to be Garmin's own data?

I believe some Garmin models support custom avoidances. Those with a sufficiently fervent desire for avoiding RLCs presumably could laboriously enter one avoidance per camera by hand.

According to an FAQ entry from Garmin support, custom avoidance is available on "55, 56, 65, 66, 800, 805, 5000, 2400, 2405, 2407, 2408, 2505, 2507, 2508, 3400, 3500, 3507, and 3508 series devices, the dezl series, Camper/RV 760, zumo 350, 390 and 590 "

I only have a few to avoid most times, I'll try that. Starve the RL Pig, lol

Even set on fastest time the gps will sometimes route off of the highway through side roads then back on the highway. I usually try to check the route before I start a trip to an unknown location.

Use your GPSR in areas you are not familiar with. In areas when you know better a route by all means take it.

GPSR's contain a computer that "triangulates" its own position by getting bearings from three satellites to calculate a 2D position (latitude and longitude) and track movement. With four or more satellites in view, the receiver can determine the user's 3D position (latitude, longitude and altitude). Once the user's position has been determined, the GPS unit can calculate other information, such as speed, bearing, track, trip distance, distance to destination, sunrise and sunset time and more.

Map data supplied by mapping companies can contain glitch errors during the the alogorhrm conversion to specific GPSR manufacturers from the raw data as well as the bad data it's self.

Play with fastest and shortest settings, tolls and the the others until your comfortable with them.

Still today on long trips I look over a Road Atlas so I get the idea of the trip a head, and keep the Atlas in the pocket behind my seat, you never know when one of the mapping glitches will occure.

Complete faith in a GPSR will sooner or later bite you. As you have already testified has happened.

For more info on what can cause GPSR errors see this link:
http://www8.garmin.com/aboutGPS/

Use the GPS when in the area is not familiar with and use your knowledge when in the area familiar only use it to avoid the traffic and not familiar with alternate routes. It is not a foolproof. It only meant to get from point A to point B without paper map.

It seems to me that if a person is driving in a safe manner that at RLC or SpeedCam would not be an issue. Perhaps I am incorrect, but I thought that you had to enter into the "Red Zone" (past the stop line) to trigger a RLC.

Now back to the main topic. I have yet to have my 2460 take me somewhere I didn't want to go. Not true of my former Magellan. If I am going somewhere I have never been I do a little research on the area, giving me a general idea of the route. New locations take a while to get mapped, and as I found a few weeks ago, AFB housing is iffy. My few years and limited use of GPSs, I would give my past Magellan a B- (terrible at rerouting) and my nuvi 2460 an A.

Agree

Agree

I have had my GPS tell me "There is a better way to go"
And there was NO other way to go! It was one road in North Dakota with no other roads anyplace near it.
If I hit OK it would recalculate and keep me on the same road I was on. If I didn't let it do it's thing, it would just keep annoying me til I did.

Has anybody successfully set this up? I'm relocating to Southern california and want to setup to avoid redlight camera intersections (say 10) in a few cites (4)?

This would be true if at least 3 other things were also true.
1) You never make a mistake.
2) The camera is installed in a fair and consistent manner.
3) The camera never records an infraction for legal vehicle operation.

You may be able to make 1) true. If you have been following along you will find that 2) and 3) are far too often not true.

ummm maybe selected longest route??

This is the 2015 version of the age old question of,

Why did the chicken cross the road?

See this FAQ: http://www.poi-factory.com/node/43584

Let me elaborate, back in the late 60s I drove a Yellow Cab part time in Philly, many times I would ask the rider which way did they prefer to go, many times their way was longer than my way but who was I to argue with the PAYING customer when it was in my favor.

So what you need is a GPS that ask turn by turn which way you want to go, this way you will be happy and the GPS will never send you down the "wrong" road.