From: Washington D.C.
I did my best using Google Earth, etc. I did have the "Underwater" issue and I believe everything is now moved over the land and targetable.
Yes! That's why I decided it was time to build out the islands. Sometimes, in the old version I'd also run into issues with SAMs or CDCMs being, "too deep to launch," as if they were submarines! :-)
Thankfully, the new terrain database fixes that problem, which is excellent. I've noticed a lot of the build outs people have shared included specific force laydowns (e.g. fighters, SAMs, CDCMs) and I was planning to build out something more generic, that basically includes just the airfields.
We can only speculate about what's under those radar domes, or what missiles, guns or other weapons are on those islands, or what aircraft are stationed there. Therefore a really "general" .inst file leaves those up to the scenario designer and really just focuses on the airfield and maybe some other landmarks. Who knows what will be on them in 2030? They might not even be there if a hurricane hits them. :-)