Garmin 74C 用户手册

Try to place the projector directly in front of the center of the screen, 
facing it toward the screen squarely. If the projector isn’t positioned 
this way, the image will be “keystone” shaped, instead of square or 
rectangular.

If you place the projector below the level of the screen, you’ll have to 
tilt it up by extending the feet. This also causes the image to lose its 
rectangular shape, but the Auto Keystone feature corrects the 
distortion automatically. If the image does not regain its rectangular 
shape, the tilt angle is greater than 15° or the Auto Keystone feature 
may have been disabled. To turn it on, see page 52. To adjust it 
manually, see page 35. 

You can also project from behind the screen or from the ceiling, with 
the projector mounted upside-down: 

To project from overhead, you’ll need the optional ceiling mount 
hardware. (See page 12 for ordering information.) You’ll also need to 
select 

Front/Ceiling

 or 

Rear/Ceiling

 for the 

Projection

 option in the 

Advanced menu. To project from the rear, select 

Rear

. See page 53 

for more information.

Front/ceiling projection

Rear projection (using a 
translucent screen)

Rear/ceiling projection (using 
a translucent screen)