Imperial DS1 - Manual (Page 22)

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10. Antenna Direction Help
Although you have entered correct values in
Antenna Set up menu, if your antenna is
positioned incorrectly, you will not receive signal
from the Satellite.
So Imperial DS1 provides Antenna Direction Help
in order to let you have exact information to direct
your antenna toward a satellite.
First select your desired Satellite name and then
the location of selected satellite will be displayed.
In case the location of the satellite is changed,
you can re-set to the new location.
Second, enter the value of Longitude and
Latitude.
After entering the correct value of your position,
place your cursor on Compute and press the OK
key.
Then Imperial DS1 shows the exact information
of antenna.