YS-S4 Multi-rotor Autopilot User Manual V1.4
18
SWITCH
OFF
the
RC
Transmitter
whilst
the
autopilot
is
still
powered
on,
the
‘Flight
Mode’
should
switch
to
display
"Return
and
Land"
,
“
Land
”
or
“
Auto
hover
”
(
these
options
are
the
chosen
F/S
settings
from
your
PC
GCS
)
the
throttle
stick
indicator
should
be
in
the
middle
and
displayed
in
GREEN
.
If
not,
please
setup
the
fail
‐
safe
(F/S)
again.
7.
Adjustment
Outdoors
7.1
GPS/Compass
Calibration
When
using
the
S4
V2
autopilot
for
the
first
time,
the
GPS/COMPASS
must
be
calibrated
before
arming
the
motors.
IMPORTANT:
（
1
）
Compass
calibration
does
not
need
to
be
done
every
time
you
fly
but
should
be
done
when
components
are
moved
or
if
the
aircraft
flies
in
unexpected
ways,
like
in
circles,
for
example.
(2)
ALWAYS
carry
out
this
calibration
outdoors,
far
away
from
metallic
objects
(cars,
radio
towers,
power
lines
etc.).
There
are
two
ways
to
calibrate
the
compass:
by
Smartphone
(with
WI
‐
FI
module)
or
by
PC.
There
are
3
steps
to
follow:
1.
Level
calibration
2.
Vertical
calibration
3.
Save
GPS/COMPASS
data.
