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The tick marks on the inner scale can be used to supplement the hour scale.Between "4:00" and "4:30" each tick mark represents 10 min. EXAMPLE: Between "1:50" and "2:00" the tick mark represents 5 min.On the hour scale, the tick marks represent either 5 min.EXAMPLE: 120 min., or "12" on the inner scale is also 2 hr.On the inner scale, minutes may be translated to hours and minutes by reference to the hour scale, which is below and inside the inner scale.The second tick mark to the right of "35" may represent 3.6, 36, 360, etc. The first tick mark to the right of "35" may represent 3.55, 35.5, etc.The first tick mark to the right of "17" may represent 1.72, 17.2, 172, etc.The first tick mark to the right of "10" may represent 10.1, 101, 1,100, etc.On both the outer and inner scales you will notice that the number of tick marks, or graduations, vary between numbers.

The numbers on the outer and inner scales represent multiples of 10 of the values shown.

In the center of the rotating portion are three "holes" (windows) used to compute corrected (true) altitude, density altitude, and true airspeed.

This arrow is used as a reference to a rate, such as knots (nautical miles per hour) or gallons per hour.

The number "60" on the inner scale has been replaced with a triangular-shaped arrow, referred to as the Index ( ).

The inner scale is used to represent time, calibrated or indicated airspeed, and calibrated or indicated altitude, depending on the calculation being performed.

The numbers on the edge of the rotating portion are referred to as the INNER SCALE in this document.

The outer scale is used to represent distance, fuel, ground speed, true airspeed, or corrected (true) altitude, depending on the calculation being performed.

The numbers along the outside of the stationary portion are referred to as the OUTER SCALE in this document.The calculator side consists of a stationary portion with a flat circular portion attached. FAA Safety Team – Promotional Request Form.Gleim Virtual Cockpit® BATD FAQs and Tutorials.X-Plane Flight Training Course – Multi User.X-Plane Flight Training Course – Home User.Gleim Virtual Cockpit™ BATD (FAA-Approved).Flight Instructor Refresher Course (FIRC).FIRC: Flight Instructor Refresher Course.