/members-area/personalblogs/b/nexgen-flight-simuator/posts/nexgen-cdi---id-453-arn-30eID-453/ARN-30E Image 1 (front)Image 2 (rear) This is a Course Deviation Indicator type ID-453/ARN-30E as used in the Vietnam War era UH-1 Bell Huey Helicopter, OV-1 Mohawk, and C-7A Caribou. See diagram from the UH-1 Flight Manual. TM ...en-USTelligent Community 12