Downloading problems for Speed camera's to my Garmin 255wt

wrinklyrocker · Posted: Wed Feb 16, 2011 6:25 am Post subject:

ATT BigPerk
Thanks thats useful info. I think I have accidentally found the reason for my problem, I could kick myself. When my Garmin was last connected to the computer I right clicked on the Garmin Drive image and then properties to see what spare memory capacity was available on the internal storage. It showed 1.85gb used and just 744kb free. The bulk of the used storage was taken up with gmapprom.img which I assume is the majority of the UK and European maps. I thought I placed these on my 4gb sd card but obviously not. I now need to find out if I can copy this file to my computer, paste it to my sd card then delete the file from the Garmin internal memory.
As I said “no fool like an old fool” my computer skills (such as they are) are restricted to music production mixing my voice to backing tracks and burning the finished product onto CD’s. When working In Brittany the SatNav is vital to find my way to and from venues.
Thanks again
wrinklyrocker

dales · Posted: Wed Feb 16, 2011 12:08 pm Post subject:

It does seem reasonable that, if the internal memory is getting full, then sending camera data to it could result in error messages.

For this reason, on my 255wt, I have the european mapping in the internal memory, and I have my camera data on the SD card.

Also, to free up internal memory, I took a full backup, and then deleted all the foreign files in the folders called Help, Text and Voice. I also deleted the Cyclops files in the Poi folder, together with all the Vehicle icons apart from the one I use.

As far as I know, a map file on the SD card must be called (or renamed as) gmapsupp.img or the device will not read it. (However I would prefer to leave the map in internal memory, and use the SD card for camera data).

Dales.
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nuvi 2599LMT-D, oregon 700, basecamp, memory-map.

dales · Posted: Wed Feb 16, 2011 2:26 pm Post subject:

By the way, if you are putting the map on the SD card, it will need to go in a folder named Garmin on the card, I believe.

Dales.
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nuvi 2599LMT-D, oregon 700, basecamp, memory-map.

wrinklyrocker · Posted: Thu Feb 17, 2011 7:43 am Post subject: Garmin loading speedcam problems

Hi Dales,
Well I removed the file gmapprom.img, all 1,811,840 kb's of it from my Gramin device by using Windows Explorer. This was very slow about 45mins. I copied the file just for safety sake, and then pasted the file onto my 4gb SD card installed in my Garmin. I then loaded the UK & FRENCH speed cameras at the same time as the POI's I wanted and low and behold the loaded perfectly. I held my breath while I fired up the Garmin and all seemed well. I located our address in Brittany and selected “map view” and sure enough it came up. So far, so good. I later went out to test it on "map view" and that's when my elation ended. The vehicle icon was not tracking at the correct speed, and was very jerky. It works to the extent that the new speed cams and POI's were in place but is distracting as streets that you have just past have not been arrived at on the screen. I can only assume that the delay is caused by the maps being loaded on an extension ie the SD card or loading the program by cut and paste is the cause. If I could find a way of editing the img file and dumping the maps for countries that I don’t need might help. Looking on the positive side The Garmin seems to work OK. Hopefully when I have to go the France at Easter I will have sorted things out.

Wrinkly rocker.

Pocketgps · Posted: Thu Feb 17, 2011 1:22 pm Post subject:

Now you can see that its working, why not rename the gmapprom.img on the mem card to gmapprom.img.ok

Then copy the backup gmapprom.img back to the Garmin internal memory. See no reason it should not work and the poi's are now on the mem card.

BigPerk · Posted: Thu Feb 17, 2011 6:13 pm Post subject:

dales · Posted: Thu Feb 17, 2011 10:46 pm Post subject:

Yes, I think that maps on the SD card do run a little slower than maps in internal memory. Not much, but enough for me to prefer to have the main mapping in the internal memory.

So, because my internal memory is getting full, I have my camera data on the SD card (and that's also why I deleted some non-essential content from the internal memory).

It is possible to edit the map down, but you need the MapSource program. If you have this (or can get hold of it) I can tell you about the editing procedures.

Dales
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nuvi 2599LMT-D, oregon 700, basecamp, memory-map.

dales · Posted: Thu Feb 17, 2011 10:54 pm Post subject:

BigPerk,

Yes, loading English and French cameras at the same time does seem likely to cause an mph/kph conflict. There's a Sticky in the Garmin section of the forum, about how to do it properly. (NB Ash10 does it automatically for me!).

But this wouldn't cause map jitters, it would just give warnings at the wrong speeds, I feel.

Dales.
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nuvi 2599LMT-D, oregon 700, basecamp, memory-map.

Andy_P · Posted: Fri Feb 18, 2011 12:26 am Post subject:

Darren · Posted: Fri Feb 18, 2011 8:59 am Post subject:

You've hit the nail on the head there. A fast memory card is at least as efficient as on-board flash memory and often many times faster.

If there is a performance issue then the bottleneck will likely be a slow card.
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Darren Griffin

wrinklyrocker · Posted: Sat Feb 19, 2011 11:38 am Post subject:

Hi guys,
Well I’m back where I started except without any Garmin Speed-cams or Garmin POI’s. I have been trying various things without success and the only way I could get the Garmin to track smoothly was to replace the map file that caused the original problem back onto the internal memory. To enable this I had to remove the POI folder to free up enough space.
I wonder if moving map files using Windows Explorer only works in part because the maps should be installed on the Garmin or external SD card not just placed there! I can’t remember loading the maps when I first had the Garmin some 18months ago, bur I’m sure there was a installer “mapinstall” or procedure that had to be used.
Another think comes to mind is with POIloader should this give the option of installing files to internal or external memory? I don’t remember seeing it when I downloaded the POI’s. I have pinched my wife’s SD card and cleared it, with the intention of trying to load the speed cameras and some POI's as an external supply.
My thanks to everyone, I am really grateful for all the time and effort provided, I’m sure I will get there in the end.
wrinklyrocker

Darren · Posted: Sat Feb 19, 2011 11:51 am Post subject:

You should be able to install POIs to a Memory Card connected to your PC via a card reader. And then insert the card into the Garmin.
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Darren Griffin

dales · Posted: Sat Feb 19, 2011 1:14 pm Post subject:

Yes, using a card reader is the best way - it's faster to load up. They only cost a few ££.

But if you haven't got one, you can select the SD card in PoiLoader.
Plug in your nuvi with an SD card installed. When you get to the Find Device screen, you should get a drop-down list. Here you can select the Nuvi or the Removable Media (ie the SD card).

Dales.
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nuvi 2599LMT-D, oregon 700, basecamp, memory-map.

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