Eagle Tree Vector - Manual (Page 78)

USER GUIDE
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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!!