Garmin gpsmap 78 用户手册

Appendix

Radio 

frequency/

protocol

2.4 GHz/ANT+ wireless 

communications 

protocol

GPS accuracy

< 33 ft. (10 m) 95% 

typical use

GPS is subject to 

accuracy degradation 

to 100 m 2DRMS under 

the U.S. DoD imposed 

Selective Availability 

(SA) Program when 

activated.

DGPS

From 10 to 16 ft. (from 

3 to 5 m) 95% typical 

(WAAS accuracy in 

North America)

Altimeter

The barometric 

altimeter is available 

only with the GPSMAP 

78S and GPSMAP 

78Sc.

Compass

The three-axis 

compass is available 

only with the GPSMAP 

78S and GPSMAP 

78Sc.

Use the battery save option to save 

battery power and prolong battery life.
  From the main menu, select Setup 

> Display > Battery Save > On.

Extensive use of screen backlighting 

can significantly reduce battery life. 

You can adjust the backlight brightness 

and decrease the backlight timeout to 

maximize battery power.
1.  Quickly press   to open the 

backlight status page.

2.  Use the Rocker to adjust the 

brightness.

  From the main menu, select Setup 

> Display > Backlight Timeout.