Hi John I don’t have a Fenix. Did it ever worked before? Did you try different build options already (with/without index/routable/non-routable). Do you use the gmapsupp.img or a mapinstaller? Which style do you use? Which Fenix version?. Great Brittain map is pretty huge, how small was your ‘small map test?’ I read that there is something as firmware updates for the fenix, maybe that can help. Kind regards Joris Van: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> Namens John Thorn Verzonden: donderdag 28 mei 2020 16:49 Aan: mkgmap-dev@lists.mkgmap.org.uk Onderwerp: [mkgmap-dev] Fenix I have built a (non routable) Garmin map of Britain with MKGMAP. A friend has lodded it to his Fenix watch. The map displays correctly but if he starts an Activity with the map open the watch crashes with no message. Even a small map does the same. Any suggestions welcome! John Thorn