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7.7.3 Pitot Airspeed Calibration
If the optional pitot tube airspeed sensor is being used, and you find that the airspeed readings are too high
or low, the "Airspeed Sensor Factor" on the Calibration screen can be used to adjust it. Increase this value
if your pitot speed is too low, and vice versa.
7.8 GPS Configuration
Several settings for the GPS are provided, on the GPS Configuration menu.
7.8.1 Choosing the GPS Position Display Format
The GPS position can be displayed in 3 formats, controlled by
the "GPS-On-screen display format" setting:
Decimal degrees (DDD.DDDDD°)
Degrees, minutes (DDD° MM.MMMM')
Degrees, minutes, seconds (DDD° MM' SS.S")
The GPS position display is most useful for letting you locate a
lost model by entering the last displayed GPS position into a mapping program (such as Google Maps™) on your
laptop or phone.
Many mapping programs will accept all three formats, but check to see which ones your program supports
BEFORE you might need to use it!
7.8.2 Changing the GPS Fix Quality Settings
In the "GPS Configuration" menu, several options are available for setting criteria for the minimum fix quality
required. These criteria must be met before the home GPS position is finalized after boot-up.
Additionally, for multirotors these criteria must be met at all times for GPS flight modes (loiter, etc.) to be
enabled.
For multirotors, allowing for a worse than the factory default GPS signal to be used increases the
likelihood of problems during GPS flight modes, such as large amounts of sudden drift during loiter!
Set Minimum Satellite Count: This lets you set the minimum number of satellites that must be in view. In
general, the higher the number of satellites, the better the position reliability.
Require 3D GPS Fix: Set this to YES if you wish to wait until a 3D GPS fix is attained.
Set Maximum HDOP: Horizontal Dilution of Precision (HDOP) is a measure of the GPS fix quality. The lower
this number is, the better the fix. The HDOP can vary with a variety of factors, including the position of the
satellites in view relative to each other. As a very general rule, HDOP of 2.0 or less is highly desirable. HDOP
less than 1.3 is desirable, but may not always be attainable.
Seconds to Wait post GPS Fix: Set this to a non-zero value if you wish to specify the number of seconds that
must elapse after the GPS signal meets the criteria above, before the home position is finalized. In many cases,
even after the GPS reports it has acquired a good fix, waiting for additional time can improve the accuracy of
the home position.
Happy Flying!!
USER GUIDE
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