One of the reasons that I keep tripping over it is that I'll look back to the tutorials on how to create islands and they're all designed for cutting islands out of seas and oceans rather than lakes. As a direct result, the island hole polys are at AMSL so the step simply isn't required.
I still forget quite regularly, unfortunately.
Regarding Hay River specifically, I haven't been there in the sim apart from flying a Buffalo liveried C-46 out of it a month or so back when testing the Commando. I did look at it in Google Earth to get some rough altitude information and can see that you may well need some sloped polys to get around limitations in the FSX default scenery. Is it far enough North that it's in FSX's "problem" zone as well, or is that further up? I know above a certain latitude, because of the way the FS world is built, it all goes a little squiffy.
Ian P.
I still forget quite regularly, unfortunately.
Regarding Hay River specifically, I haven't been there in the sim apart from flying a Buffalo liveried C-46 out of it a month or so back when testing the Commando. I did look at it in Google Earth to get some rough altitude information and can see that you may well need some sloped polys to get around limitations in the FSX default scenery. Is it far enough North that it's in FSX's "problem" zone as well, or is that further up? I know above a certain latitude, because of the way the FS world is built, it all goes a little squiffy.
Ian P.