AFCAD question

**Terry** · October 24th, 2008, 11:17

When creating a (NEW) air or sea port, where do you get your elevation from? I have been using the aircraft altimeter which works most of the time but not always.
Sometimes this will cause the area to raise up several feet. As it's a new airport there is no default AFCAD to go by. Do you correct by trial and error?

**Felixthreeone** · October 24th, 2008, 12:13

Yes....trial and error. I have found that going into slew mode and slewing to your desired location (on land) and then coming out of slew mode and re-setting your altimeter is the best option; I have not made an afcad for seaplanes as of yet, but I would assume that using a seaplane and following the guidelines i mentioned previously should work just as well.

**Astoroth** · October 25th, 2008, 00:47

Go to hovercontrol.com, and search for the file chplus.zip. This gives you a set of crosshairs that are "flyable". Use the smallest, the 9m one and set that puppy down on the ground right where you want to know the elevation. Do a shift+z, and the altitude there is what you are looking for, voila!

When you use the aircraft altimeter, it actually reads the altitude from your views eyepoint, not the ground altitude. The crosshairs eyepoint is set right at the base, so it sets on the ground.

~A~

**Terry** · October 25th, 2008, 03:42

Thanks, just what I needed. :ernae:

**PHo17** · October 26th, 2008, 02:44

Originally Posted by Astoroth

Go to hovercontrol.com, and search for the file chplus.zip. This gives you a set of crosshairs that are "flyable". Use the smallest, the 9m one and set that puppy down on the ground right where you want to know the elevation. Do a shift+z, and the altitude there is what you are looking for, voila!
...

On which category that is? File search of chplus.zip didn't result anything.