Map or unit issue. Please help.

Do you have any POI files with alerts installed? Any TourGuides? What happens if you drive by the place (normal or simulated) if all POIs and Tourguides are removed?

Picking up on CraigW said, why don't you go into the \Garmin\POI\ folder on the GPS and change the extension(s) from ".gpi" to 'xpi" (or whatever) and then simulate again.

This would let you know whether it was a function of a POI that you had previously loaded.

Thank for the suggestion, will try that next.

first time i ever heard of an issue like this. would be very interested in finding the reason.

It's not common, but it's come up here before. One possibility (especially since it occurs both in real travel and simulation mode) is that the problem arises when it tries to give navigational instructions and a POI or TourGuide alert at the same time.

Some have suggested that switching from mp3 audio alerts for POI files (for those GPS units that can play mp3s) to wav audio (with sox.exe) will lessen the problem.

New and weird data point. It is a map view type issue/display processor power.

Somewhere between less and normal detail in a north up view at 300ft scale just panning around the screen will cause a shutdown in the trouble area.

My next step when home is to remove pois and see what happens.

I drove right on thru there today but I had the screen in the dashboard setting!

Thanks for all the help.

Wow, good sleuthing. I just checked in Mapsource and that area's not at a junction between map segments. I do see that the location's got a lot of roads and ramps so maybe the GPS is getting confused and trying to swap you from your ramp to an adjacent roadway or ramp and just gives up and shuts down. I also did an eyeball comparison on the new map to the past five versions of City Navigator and see no changes between maps that might account for a problem with this map if the problem hasn't occurred before.

Your 2D NorthUp Normal/Less should be using less processor power than the default 3D TrackUp Normal, making understanding this worse.

I just simulated your route on my nuvi 750: "3D TrackUp Normal" from I-275 & 8 Mile to I-696 & Orchard Lake, both with Jack and with Jill. I had no freezeup in either simulation. I wonder if a re-download and reinstall of the new map might help you.

If this has only been an issue since the last map update (and after a hard reset), then I'm tending to go along with your thought that it's a map (or a corrupt map file) issue rather than a POI file, especially if no navigation or POI audio normally occurs there. Darn, and I fear you'll say this is a nearly daily area in which you travel. I wonder what Garmin would say if you emailed or called them to report the issue.

I doubt it's a map problem. Maybe there's a red camera nearby, and the unit tries play both files when it crashes like Craig said.

I'm not sure. My two simulations that worked ran with the (POI Factory) red light and speed camera POIs loaded, complete with icon and wav sound--also a School TourGuide with icon and audio for school zones. I had no freeze and no indication of a POI alert over the entire trip. I will admit the POI files in my 750 are not the most current versions. Given the number of ramps and exits, this route does have a lot of navigation audio.

It is confusing.

Another thing I noticed is how much the unit auto scales from 300 to 800 to 500 to 300 to........ in that area with all the ramps too.

This is my daily commute and the main reason for the GPSR now is traffic as I already know where I am going.

Hmmm I have been thinking about a nice 765....

I did note a lot of zooming in and out on my two successful simulations in 3D TrackUp, as you say. I can see where that'd increase the need for CPU and graphics power. But then, I didn't get a freeze on my 750 which probably uses the same electronics as your 760.

Then again, I have no reason to deprive you of a reason to buy a 765

Just curious--have you tried the route in 3D TrackUp Normal?

You may want to look at this post http://www.poi-factory.com/node/28569

Charlie provided a thread in which a 750 (same as the 760) locked up at a certain spot. After much discussion it was concluded that a POI file had been loaded with an icon that was sized incorrectly. It becomes a problem when you approach a POI using that icon. That would account for scrolling past a certain area. If the nuvi tried to display an icon that was not correctly sized, it locked up.

Try deleting all POI icons and run POI Loader again without them. I predict that the freeze-up problem will go away.

http://www.poi-factory.com/node/28569

dobs108

Tried a simulation on a Nuvi 760 with 2011.30 maps and didn't get a lockup. I once had a similar issue caused by bad map data in 2009; in this case perhaps Charlesd45's suggestion is a likely possibility.

Thanks guys, I am also going to guess that Charley does have the answer and I disabled the POI file and it ran fine, north up, TTS, re-enabled and it failed again.

I just wonder why it started happening now?

More odd ball data points.

1. If the unit is powered in the car, simulation or real the unit locks. If it is on battery it just shuts itself off.?.?.

2. It ran fine at full detail, north up, simulation, but just English directions, no TTS.?.?.

3. It runs fine at full detail, TTS, simulation, full poi file in both 3d and track up.?.?.

Well not leaving things alone and trying to figure out why this issue just popped up I kept fiddlin'.

Well I took a shot in the dark and reinstalled the new map data 2011.3.

I have run the simulation 5 times with no issues, TTS voice north up tracking and my POI file intact.

Now we will see what happens on the third.........

Thanks for all your help guys hope I can return the favor some day..

Great news!

Not so great.

After running the simulation and passing 5 times I had a reason to drive thru the issue area and it failed. I then for giggles ran the simulation and it to failed. Arrrrgggghhhhh.

Time to play with poi's, I think I am going to try a reverse method and removed them one by one.... I have a feeling the unit just gets a bit to overloaded with tts, road/ramp changes, and poi icons all popping up at the same time.

Or I just may removed all the bmp. images as you really rarely see them anyway.

Thanks again,

Take the bmps out and copy them.Put back one at a time until you find the guilty party.After reading about the bmp problem I did remove over 3/4 of mine.Like you say you rarely see them.