Quote Originally Posted by jonnyv View Post
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it must be the way the map is sourced, from mapsource or other place ?
This is perhaps the problem. There is ample evidence that using MS rather than MI with recently released gmap folders can result in slight differences in the generated map image file and ultimately that might transcribe to performance deficiencies or issues. The .img might be OK, but it might not. The answer is simple [although maybe unpalatable to some of us still clinging to MS] and that is to do what Garmin says and not use MS because it's no longer supported and modern gmap folders are better handled by MI. Well-intentioned members maybe are still uploading images from MapSource. Download a gmap folder if possible and compile your own image using BaseCamp/MapInstall for all recent and future CNs and you should have no problems. Uploaders rarely post the source of image files [directly from LM device, separately purchased map, if compiled how it was done, etc].
Any further discussion on this should continue elsewhere if needed, but it's really unnecessary imo.