Can't seem to log onto garmin forums at the moment, and Garmin support have proved useless.
My preferred use is to display courses, or multiple of on screen in different colours and follow the line, not using the navigation option. having done this for years I now have a problem after the new map update.
Courses no longer show up on screen, in any colour, at any zoom level. after lots of experimentation I found that it worked fine without all the mapping enabled.
i then loaded up an opensource GB map and bingo it now works. Bloody annoying that i cant use the Europewide garmin map, anyone else noticed this problem or found a way round it. maybe a warning to others, don't update the map.
The new map was loaded onto an SD card, named D4728080A : yet other image files D4713050A and gmapbmap and the huge gmapprom still remain on the unit.