ALT-1 Operating Manual
Page 5
Da = Density altitude
Pa = Pressure altitude
T = ambient temperature in degrees C
Ts= 15 - 0.0019812 * pressure altitude (ft)
Da = Pa + 118.6 * (T-Ts)
3.7 OAT (Outside air temperature) Display
The OAT probe is used to determine density altitude.
4 Menu System
Pressing the rotary control button during the normal display mode will cause the ALT-1 to enter the menu system. Use the
up/down keys or the rotary control to navigate through the menu system.
Temperature
unit
OAT reading
Temporary maximum and
minimum OAT since
instrument power up, reset
using the F1/up key
Local pressure readout (either in
millibars or in inches of mercury)
Digital VSI readout,
can be turned off in
the menu system
Compensated
density altitude
value
Altitude unit
Uncompensated
altitude value
