Mission planner: Takeoff command altitude error

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What steps will reproduce the problem?
1. Add a takeoff command to your flight plan, set the altitude parameter to 10 
meters.
2. Write the flight plan to the APM
3. Read the flight plan back into the mission planner.
4. The take off command altitude will be incorrect.

What is the expected output? What do you see instead?
If I set the takeoff command altitude to 10 meters and the altitude of the 
aircraft is 328 meters, writing and then reading the flight plan from the 
autopilot results in a takeoff altitude parameter of -318 meters.

What version of the product are you using? On what operating system?
APM 1.4, 2.6 firmware, 3DR 900Mhz telemetry, MP 1.2.10

Please provide any additional information below.

Original issue reported on code.google.com by markpe...@gmail.com on 1 Sep 2012 at 3:14

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Operating System: Windows XP

Original comment by markpe...@gmail.com on 1 Sep 2012 at 3:21

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Original comment by Meee...@gmail.com on 6 Sep 2012 at 12:19

• Changed state: Fixed