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ILEC SN10 User Manual

SN10 Flight Pages – Competition Mode

3.6 Alternates Page

The Alternates page helps you select an alternate

landing field and plan a final glide to this field. It is

very useful when you are unable to complete a task

and need to find a safe place to land. The SN10

shows final glide information to two independent

choices, so you can easily cycle from one alternate

to the next when crossing hostile terrain. Alternates

are ordered by distance, with #1 the closest landing

field.

In the illustration, the first (closest) alternate is Bayreuth. Bayreuth is at bearing 270, 1.2

miles away. The arrow next to 270 shows you need to turn right in order to track

towards Bayreuth. You are 1421 feet above final glide altitude, calculated with an

arrival altitude of 500 feet (150 meters) AGL. The final glide altitude is calculated using

the wind you have set for final glide, using the current MacCready setting, bugs, water,

and altimeter setting, and using the field elevation for Bayreuth from the database.

To find the closest landing field, place the cursor on the # field and spin

VALUE rapidly

counter-clockwise to get to choice #1. You can also choose a specific alternate by

name; just place the cursor on the point name and change

VALUE (just like choosing a

turnpoint of the task).

If you wish to see additional information about an

alternate, place the cursor on the alternate name

and press

HELP. The illustration at left shows us

Erbendr is an abbreviation for the Erbendorf-

Schweis gliding field, elevation 1,624 feet, radio

frequency 123.350. No field length is given, but

we can see it’s marked in the database as an

airport (A), a task turnpoint (T), and most

importantly that it’s a good landing field (L). See

The SN10 Database for more information about

point data.

To Go Direct to an alternate, place the cursor on

and press

ENTER to change

your task to fly direct to the alternate. This will:

Remove any points you have not yet achieved from the task,

Record the point at which you abort the task as the point AbortPt,

Place AbortPt as the last achieved point of the task,

Reset the task finish point to the selected alternate,

Reset the task finish altitude to the alternate elevation plus 500 feet,

Draw the courseline from the current position (AbortPt) to the alternate on the

moving map, and

Software Version 2.31

Manual Revised 13-Dec-2005

Page 12 of 91

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