Skycranes and Altitude POV - A deadly recipe for disaster

[lextacy]

So if im going to use a skycrane to lower a rover, I have a concern about using mechjeb to land it while using action groups to trigger the release of crane. At what point of reference would the skycrane/rover assembly measure the altitude AFTER the crane lowers the rover. Would your true altitude read from the skycrane or the rover? This is critical to know because the release of the crane could pose a problem. If the altitude is read from the point of crane then the crane could propel way to close to the surface when its suppose to have rope slack. Thus crushing the rover.

For those of you who have used mechjeb to do skycrane delivery , what method did you use to safely drop and ditch ?

[Taki117]

I do it manually. Pull up the surface info window (for altitude) and SmartASS to cancel horizontal velocity, then it's all manual.