TM 1-1510-218-10 3-71 Figure 3-99.  CAL 4 Page 1.   Select the CAL 4 page on the left side. 2.   Press the left  CRSR button to turn on the cursor function. 3.   Use  the  left  inner  and  outer  knobs  to enter  what  the  aircraft's groundspeed will be during the descent or ascent. 4.   Turn  the  left  outer  knob  to  move  the cursor  to  the  first  FPM  position,  and then  enter  the  desired  rate  of  descent or  ascent  (in  feet  per  minute)  using the  left  inner  and  outer  knobs.    The descent/ascent angle is now displayed.    In  addition,  an  angle  may be    entered    and    the    angle    will    be determined. 5.   Press the left  CRSR button to turn off the cursor function. (5)   The Calculator 5 Page.  The CAL 5 page is used to perform two types of conversions: between °C   and   °F  and  between  knots  and  miles  per  hour.   Refer to Figure 3-100. CAL 5 TEMP/SPEED    030^oC    086^oF    260KT    299MPH Figure 3-100.  CAL 5 Page 1.   Display  the  CAL  5  page  on  the  left side. 2.   Press the left  CRSR button to turn on the left cursor function. 3.   To convert °C to °F, use the left outer knob  to  position  the  cursor  over  the appropriate Celsius digits and use the left  inner  knob  to  select  the  desired values. When the desired temperature   in   °C   is   selected,   the corresponding   temperature   in   °F   is displayed. 4.   To convert °F to °C, use the left outer knob  to  position  the  cursor    over  the appropriate Fahrenheit digits and use the    left    inner    knob    to    select    the desired   values.      When   the   desired temperature   in   °F   is   selected,   the corresponding   temperature   in   °C   is displayed. 5.   To  convert  knots  to  miles  per  hour, use the left outer knob  to position the cursor over the appropriate knot digits and  use  the  left  inner  knob  to  select the  desired  values  of  speed.    When the desired speed in knots is selected, the  corresponding  speed  in  miles  per hour is displayed. 6.   To  convert  miles  per  hour  to  knots, use the left outer knob to position the cursor  over  the  appropriate  miles  per hour digits and use the left inner knob to select the desired values of speed.   When  the  desired  speed  in  miles  per hour   is   selected,   the   corresponding speed in knots is displayed. 7.   Press the left  CRSR button to turn off the left cursor function. (6)   The Calculator 6 Page.  The CAL 6 page is  used  to  convert  any  time  in  one  time  zone  to  the corresponding  time  in  another  time  zone.    Refer  to Figure 3-101.