Using Altitude Hold
Alti
tu
de
Hold
helps you
m
ain
tain
a co
nstant altitud
e.
The current pressure
altitu
de
is store
d as a referen
ce
an
d is
the
disp
layed valu
e u
nl
ess Alti
tu
de
Ho
ld i
s
activate
d. T
he
hold alt
itude
is
dis
playe
d in 1
00-f
oot
incre
m
ents. The
dis
pl
ayed
altitude
is the s
ame as is sent
for Mode C interrogation replies. When the
HLD
button is pressed, the
alti
tude dis
play
wi
ll be set
to
“+00
0.” The
altitu
de di
splay
values will incr
ease/decrease a
s the aircra
ft ch
anges
altitude.
The
alti
tude di
splay
will flash when
the aircraft
cha
nge in al
titude
excee
ds the sele
cted threshold.
Set
ting th
e H
old Alt
itud
e
1.
Press the
HLD
button to set the current altitude as the hold altitude. The
LED above
the
HLD
button
w
ill light t
o indic
ate Alt
itude
Ho
ld is ac
tive.
2.
The Altitude
display now shows a value that
is relative to the
hold alti
tude i
n
100-
foo
t incre
m
ents.
A
dis
played value
of
+
001
means you
are 100
ft
abov
e
the hold altitu
de.
Set
ting th
e Al
titud
e Hold B
uffer
1.
Set the Al
titu
de Hold Buffer
value by pressing the
HLD
button f
or tw
o
seconds, or longer. Select a
valu
e between
200 and 2500
feet. The fact
or
y
default value is
300 fee
t.
The value is reta
ined
when the SL70
is turned of
f.
2.
Turn the
S
MALL
knob to change the buffer value, such
as
±02. Press
HLD
again to save the value.
Displays
Squawk Cod
es
The four-
digi
t s
quawk co
de
is s
hown on the le
ft side
of
the
dis
play.
Alt
itud
e
The Altitude
display is used
to
show t
he press
ure
altitu
de, H
old Alti
tu
de,
an
d
Hold Al
titu
de buffer with 10
0 ft resolution.
© 2003 by Garmin AT, I
nc
. A
ll rights
reserved. Printe
d in the U.
S.
A.
G
armi
n A
T,
Inc
.
2345 Turner
Roa
d,
S.
E.
Salem
, OR
97302
U.
S.A.
Toll Free
800.
525.
6726
Canada
Toll Free
800.
654.
3415
In
ter
national 503.
391.
3411
FA
X
503.
364.
2138
Visit
our web pag
e
at http://w
ww.g
arminat.com
Apollo
®
Mode C Transponder
Model SL70
Operation Manual
August
20
03
560-040
1-0
0
a
