Citation mustang pilot reported a track deviation while departing vny on the wlkkr two SID; due to a...

Attributes
ACN	1518001
Time
Date	201802
Local Time Of Day	0601-1200
Place
Locale Reference	VNY.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Cessna Citation Mustang (C510)
Operating Under FAR Part	Part 91
Flight Phase	Initial Climb
Route In Use	SID WLKKR TWO
Flight Plan	IFR
Component
Aircraft Component	FMS/FMC
Person 1
Function	Single Pilot
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 25 Flight Crew Total 3500 Flight Crew Type 1000
Events
Anomaly	Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types

Narrative:

Flying the wlkkr two departure I missed the initial heading leg; and turned toward the initial off-airport fix luvvy. ATC noticed and gave me a heading to fly on course. No conflicts and good VFR at all times. The root cause is a combination of a badly designed departure procedure and/or a limitation of the garmin 1000 software. The issue the walker 2 departure has an initial turn fix that is before the end of the takeoff runway (fatko). The garmin G1000 does not support sids that have turns before the end of runway; so this departure is not in the database. For correctly designed procedures; I can pick the departure in database and fly the entire procedure using navigation mode. To fly this procedure on the garmin G1000; I need to manually enter all the waypoints in the flight plan. Then I must also dial in a heading of 210 and also takeoff using heading mode on the autopilot.my mistake was to forget about this issue; and took off in navigation mode like a normal procedure. I will not make that mistake again; but other pilots with garmin avionics are likely to also have problems with this procedure. Simply moving fatko a few feet past the end of the takeoff runway would probably solve the problem.

Original NASA ASRS Text

Title: Citation Mustang pilot reported a track deviation while departing VNY on the WLKKR TWO SID; due to a Garmin software limitation regarding waypoints that command turns before the end of the runway.

Narrative: Flying the WLKKR TWO departure I missed the initial heading leg; and turned toward the initial off-airport fix LUVVY. ATC noticed and gave me a heading to fly on course. No conflicts and good VFR at all times. The root cause is a combination of a badly designed departure procedure and/or a limitation of the Garmin 1000 software. The issue the Walker 2 departure has an initial turn fix that is before the end of the takeoff runway (FATKO). The Garmin G1000 does not support SIDs that have turns before the end of runway; so this departure is not in the database. For correctly designed procedures; I can pick the departure in database and fly the entire procedure using NAV mode. To fly this procedure on the Garmin G1000; I need to manually enter all the waypoints in the flight plan. Then I must also dial in a heading of 210 and ALSO takeoff using HEADING mode on the autopilot.My mistake was to forget about this issue; and took off in NAV mode like a normal procedure. I will not make that mistake again; but other pilots with Garmin avionics are likely to also have problems with this procedure. Simply moving FATKO a few feet past the end of the takeoff runway would probably solve the problem.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Citation mustang pilot reported a track deviation while departing vny on the wlkkr two SID; due to a garmin software limitation regarding waypoints that command turns before the end of the runway.