Brand new airfield

[BB-Rayner]

I have just spent about four hours building an airfield in Norway. I found a picturesque fiord with a nice flat piece of land by the waters edge and laid out my runways. Then I added all the furniture , static aircraft, trucks etc

Naturally I made this new field my home base. But when I went into my dogfight missions and loaded the mission the field and home base didn't show up on the map.

What have I done wrong?

Also, when building new missions how do I get a siren to sound when the field is under attack?