Current questions and answers regarding the map editor.

<MoonCalendar href=GameMechanics/MoonCalendar/MyCalendar.xdb#xpointer(/MoonCalendar)/>

It needs to be done like this:
MoonCalendar href="/GameMechanics/MoonCalendar/MyCalendar.xdb#xpointer(/MoonCalendar)"/>

Is it supposed to be that the edits appear in the root of the map, and not in Maps/SingleMissions.

There's no way to check the "passability" of water territory without workarounds) You can either assess it visually, or by placing water objects: for example, if a cell on water is blocked by a rock, then placing a buoy there won't work.