The default map shown for activities is based on OpenStreetmap. The latter is continously updated by the community. The Connect map however is over 4 years old, as seen on the data like new suburbs added 4 years ago still missing. Many Garmin users use their activitry recordings to update the base map and hence the trail network mapping improves over time. Yet Connect needs to update their maps from the source on a regular basis to make these as well as corrections available.