In some missions of the past, especially when our program still existed on Orbiter space simulation, there were tasks in which an aircraft or planetary vessel had to be flown constantly at low altitudes. 

In order not to crash into mountains, or hills, we invented the "altprofile" function. 


  • run takeoff
  • after "resume own navigation", stay on current heading
  • descent to approximately 2000 ft above ground
  • press the HLD button
  • press the VCT button
  • set the altitude setting to 2000 ft
  • reduce the setting, slowly, as low as possible 
  • below 300 is Harakiri


The value set in the AP panel's altitude input field is now called "delta altitude". It is no longer target altitude. 

From here, FSXPilot constantly evaluates the current ground altitude and adjusts the climb rate in a way that the aircraft will climb or sink to a value derived from the the amazing formula  

ground altitude (ft)  + delta altitude (ft) 

If the ground altitude rises (f.e. up a hill) your aircraft will climb and vice versa.

Usually, this leads to satisfactory results and you will fly around like a cruise missile.

CAVEAT: Unfortunately, in FSX we can only monitor the ground altitude directly under the aircraft. Flying fact to face into hight mountains will only work with a big "delta altitude".

Or miserably fail.  

TIP: If your aircraft is too fast to follow the ground altitude profile -> yes, you guessed it. Use a slower one.  





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