""hold north-west of the XXX VOR on the 300 degrees radial, left turns, maintain 4000 feet"?"
Here is how I would see it working:
1. The pilot would touch the XXX VOR
2. The pilot would then touch the screen "NW" of the displayed VOR. A 0-360 number would be displayed. As the pilot moved their finger, the 0-360 number would change. When it said 300, the pilot would remove finger and press an enter key.
3. Left or right turn boxes could be selected.
4. The altitude would not be used.
5. An option of "show navigation from current location to pattern entry" could be offered.
6. After all entry, two boxes of execute or canel would be available.
I don't know about your second example.
Thanks for responding, Tom
Added 12/14/2010
Wouldn't a DME field be the missing piece for your second example? Normally, it would be set to 0. In your example, it would be set to 15.
Tom