Flytec 5030 v2.24 * - Manual (Page 48)

Flytec
5030 GPS
masses have settled, or whether the wind will change. It takes into account the present
wind and assumes that no rising or sinking air masses will be encountered.
2) Gliding to Goal
Our pilot has left the thermal at the moment when the Flytec 5030 GPS shows Alt a. WP
= 0 and is flying towards his/her goal. He/she should speed up until the pre-calculated
altitude over the goal is at 0 again. His/her McCready Indicator will be around 2m/sec.
(In our example, he/she is now flying at approx. 62km/h.) He/she can even cross an
area of sink, but will have to fly afterwards with a smaller McCready ring value. Under no
circumstances should he/she allow the McCready arrow to go below 0. This means that
with good lift in a thermal, before the departure to goal, certain altitude reserves exist
because of the higher speed. If the average lift is small, the unit calculates with a glide
speed just a little more than the one for the best glide; there are practically no altitude
reserves and a small area of sink can force the pilot to land before reaching goal. In this
case one should, before leaving the thermal, increase the safety altitude by 'tanking up'.
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