Garmin GPS 90 User Manual download pdf (Page 63)

The Main Menu page also provides access to the GPS

9 0 ’s E6-B functions, which can be used to calculate

density altitude, winds aloft, fuel usage, sunrise & sunset

and vertical navigation proﬁles.

To calculate density altitude and true air speed:

1. Highlight the indicated altitude ﬁeld (IAlt) and press

2. Enter the altitude from your altimeter and press

3. Press

to begin entry of your calibrated airspeed

(CAS).

4. Enter the calibrated airspeed and press

5. Press

to begin entry of your current altimeter setting.

6. Enter the altimeter pressure and press

7. Press

to begin entry of the total air temperature (TAT).

8. Enter the TAT (standard outside air temperature gauge on

most piston aircraft) and press the

key.

The calculated density altitude and true airspeed will

be displayed at the bottom of the page.

The GPS 90 winds aloft function will calculate the

wind direction, speed and head/tail wind conditions for

you from by entering your true air speed and curre n t

heading.

To calculate winds aloft:

1. Highlight the true airspeed ﬁeld (TAS) and press

2. Enter the TAS (use the density altitude function if you do not

know TAS) and press

3. Press

to begin entry of your current heading (Hdg).

4. Enter your heading and press

The wind direction, speed and the head/tail wind

conditions will be displayed at the bottom of the winds

aloft page.

E6-B Menu

Density Altitude

& Winds Aloft

Calculating density

altitude and true

air speed.

Calculating winds

aloft.

gps 90 manual 8/6/98 10:00 AM Page 55

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Garmin GPS 90 User Manual Page 63

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