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EXAMPLE 3— VOR/DME ARC OVERLAY
Example 3 uses the VOR/DME RWY 21 approach into Topeka/Forbes Field
Airport (KFOE) and illustrates an approach based on a DME arc. Although DME arc
approaches are not based on a direct course, the GPS 155 will still provide approach
navigation guidance through the arc by constantly displaying your distance and bear-
ing from the DME reference navaid on the Position page. To fly the arc, monitor the
distance displayed on the Position page and manually adjust your heading to main-
tain the course along the arc. When flying a DME arc, the GPS SEQ switch must be
set to the HOLD position to ensure proper CDI operation.
1. Select and arm the VOR RW21 approach and select the D094G initial approach fix to fly
the left hand arc from the 094º radial. Enter the current altimeter setting of KFOE when
the ‘Need pres- press NAV’ message appears.
2. Fly to the IAF of the DME arc (D094G). The GPS WPT annunciator will flash 15 seconds
before you reach the waypoint.
3. After crossing the IAF, set the GPS SEQ switch to the HOLD position.
4. Set the desired inbound course (205º) on the CDI/HSI.
5. Press
N
and rotate
O
to display the Position page. The Position page will display the
DME navaid as the reference waypoint (on the bottom line) as long as your active to way-
point is part of the DME arc you are flying.
6. Monitor your distance and bearing from the DME navaid along the arc.
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APPROACH NAVIGATION
VOR/DME ARC Example
DO NOT USE FOR NAVIGATION
25
TOP
7
TOP
7
7
T
O
P
T
O
P
0
4
8
°
2
2
8
°
205°
205°
1 MIN
200
°
205°
IAF
TOPEKA
R-258
(IAF)
2600
(7)
(IAF)
R
-0
9
4
3000
205° (7)
A
rc
A
rc
3
0
0
0
3
0
0
0
N
o
P
T
NoPT
ERASE
5 NM 7 NM
MISSED APPROACH
CLIMB TO 3000 VIA HEADING
240° AND TOP R-213 TO
ERASE 25 DME AND HOLD.
3000
2600
200°
12
7
TOP TOP
VORTAC
ONE MINUTE
HOLDING PATTERN
025°
205°
VOR/DME RWY 21
TOPEKA/
FORBES FIELD(FOE)
155man (GOOD) 7/24/98 1:57 PM Page 76