No, that's not how it works. You can see maps of your own logged dives. However, those are not added to the Garmin Dive app "Explore" view. There is no way to add sites in that view. You might want to suggest an enhancement to Garmin.
Hello and thank you for the information! So how come we find sites already saved in Garmin maps? I take Egypt as an example where I go regularly, there are many sites already registered and others not…