I know, but it's the kind of simple math that I *should* be able to do
in my head.

Cruise altitude - target altitude = altitude loss

9,500 - 2,000 = 7,500

altitude loss/500fpm = minutes or [altitude loss/1,000] x 2

7,500/500 = 15 minutes or 7.5 x 2 = 15 minutes

Right -- and when I'm not hypoxic, that's easy stuff.

:-)

The rest of what you showed is really unnecessary, as both GPS's show
a steady count-down in minutes till arrival...
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"