Garmin GPS 75 - Manual (Page 48)

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The timer field can be selected as “Count Up” or “Count Down” by
highlighting and pressing CLR. To clear the count up timer, highlight
each time field, press CLR, then ENT.
To set the count down timer, enter the hours, minutes, then seconds to
count down from. The “Timer Expired” message will be displayed when
the timer reaches zero.
6.6AUDIO AND DISPLAY SETUP
From the Audio and Display Page,
you can turn the message and/or
keypad tones on and off, change the
display contrast, and change the
timeout for the display backlighting.
Select the desired tone option by
highlighting the “Tone>” field and
pressing CLR.
To change the display contrast...
· Highlight “Change Contrast?” and press ENT.
· The contrast bar is highlighted. Press the left or right arrow key
to change the contrast level.
· When the desired contrast level is reached, press ENT.
The Backlighting Timeout determines the length of time the display and
keypad backlighting will remain on. If no keys are pressed for the
specified time, the backlighting will automatically shut off. Set the
timeout interval by highlighting that field, entering the desired timeout
and pressing ENT.
6.7INTERFACE SETUP
From the Interface Page, you may
select the input or output format
needed to connect your GPS 75 to
other equipment: plotter, autopilot,
another GPS 75, a PC, etc. You may
select no input/output (NONE/
NONE), NMEA output, GARMIN
input/output, or RTCM input by
highlighting the cyclic field and
pressing CLR. When the NMEA