Easy way, assuming you have the France map loaded on the PC.Hover the mouse over the Cap Gris-Nez location & right click to create a "User Waypoint" (It's the little bit of land on the French coast nearest to Lydd for those that don't know, I didn't & had to look it up 
)
Right click the new user waypoint & select "View with Google Maps". If necessary, alter the position of the User Waypoint till it is exactly at the place you want. Then "Edit User Waypoint" & call it Cap Gris-Nez. It will then be on your map & will transfer to your mobile device the next time you synchronise the two.
This is one way to incorporate your favourite locations & landmarks etc. on the SkyDemon maps. No doubt others have their own way?
Regards,
Max
