I am trying to create a mission in Litchi. My question is, does Litchi use the home point for elevation or does it compute altitude from sea level? The reason I ask, is two of my way points are over a ravine. I would hate to set the altitude at 30 feet in a 50 foot ravine. That would put me 20 feet in the ravine, not good. Thanks for any and all advice and or information.