Air carrier flight crew reported difficulties in navigating a SID due to a system failure.

Attributes
ACN	1520843
Time
Date	201802
Local Time Of Day	0001-0600
Place
Locale Reference	LGA.Airport
State Reference	NY
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Medium Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Climb
Route In Use	SID LA GUARDIA FIVE
Flight Plan	IFR
Component
Aircraft Component	Flight Dynamics
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument
Person 2
Function	Pilot Flying First Officer
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types

Narrative:

On departure out of lga on the LGA5 SID connie climb; we were intercepting the 043 degree radial inbound to cri VOR when we lost our navigations; making us overshoot the 043 radial inbound to cri. We immediately corrected the issue told ATC what happened and they gave us a heading. Without any further incidents; we continue our flight to destination.

Original NASA ASRS Text

Title: Air carrier flight crew reported difficulties in navigating a SID due to a system failure.

Narrative: On departure out of LGA on the LGA5 SID Connie climb; we were intercepting the 043 degree radial inbound to CRI VOR when we lost our navigations; making us overshoot the 043 radial inbound to CRI. We immediately corrected the issue told ATC what happened and they gave us a heading. Without any further incidents; we continue our flight to destination.

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.