Maccready, Ballast And Bugs Settings; Map Settings - LXNAV LX90xx User Manual

LX90xx system Version 4.0
6.5.6.2

MacCready, Ballast and Bugs Settings

These are probably the settings pilots use most often during flight. Press the MC/BAL
button. The dialogue for MacCready, ballast and bugs will appear.
Use the PAGE selector knob to modify the MacCready setting. In the middle button there is
a suggestion for the MacCready setting which is based on the last four thermals.
Additionally to the selected MacCready value an overload factor is also shown together with
the calculated glide ratio with corresponding speed.
You will notice that the MacCready value displayed on the final glide symbol is
coloured yellow or red. The coloured value indicates that your MacCready value
is too low corresponding to the current wind and selected target. Increase the
MacCready value.
Pressing the CLOSE button will close the dialogue and return to the navigation page.
Changes will be saved. The dialogue will automatically be closed after 10 seconds if no
action is taken.
Pressing the BAL button will toggle the menu from MacCready setting to Ballast setting.
Ballast is entered in values which are defined in the Units menu (see Chapter 6.1.11). You
can set the load for an empty glider by pressing the Empty button.
Pressing the BUGS button will toggle the menu again from Ballast setting to Bugs setting.
A bug setting is used to set polar degradation due to a dirty wing.
percentage degradation of glide ratio (5% means glide ratio degradation is 5%). Pressing
CLEAN will set bugs instantly to zero. MC will return to the MacCready screen.
6.5.6.3

Map Settings

Map can be quickly configured using this dialogue. Select map orientation in the orientation
setup.
A map can have north, east, west or south orientation. These orientations are fixed and
are not changed with glider position. Additionally to this orientation there are several more
which will rotate the map as the glider position changes:
Track up will always have the glider ground track in the up direction.
•
Heading up will always have glider heading in the up direction. If the compass module
•
is available the heading will be taken from the compass otherwise the heading is
calculated from the wind and the ground speed vectors.
Goal up will have target point in upper part of screen.
•
Trk/north up is a combination of Track up and north up orientation. During circling
•
orientation will be north up otherwise Track up.
Page 97 of 151
February 2014
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