E6-B Flight Computer (APR's Premier Series E6-B2D) Complete Instruction Manual includes Section on Dead Reckoning and Wind Effect Theory Calculation Miles and Gallons Scale (Distance), Off-course & Drift Corrections, Minutes & Hours Scale (Time) Microset Alignment, Mach Number Index Window, Slide-Rule Mathematics, Wind Component Grid Color-Coded Conversion Scales, Wind Triangle Information and Low (40 to 270 kts or mi) Speed Slide Flush T/S/D Dial, Altitude Correction, Fuel Consumption, Density Altitude Factors, Wind Slide Lock