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Reference
Main Menu: Time/
Comm Tab
Time Submenu Tab— displays the current time and date, allows you to adjust the 12 or 24-hour
time format, enter a time zone, and adjust for daylight savings to show correct local time.
The following options are available:
• Time Format – choose from 12 or 24-hour (military) time format.
• Time Zone – choose your correct time zone to show correct local time or enter a UTC Offset.
The UTC (also called Greenwich Time) offset is how many hours you are ahead or behind the
time line. See the table on page 110 for time offsets.
• Daylight Savings – choose from ‘Auto’, ‘On’, or ‘Off’ to adjust for daylight savings.
Comm ( Communications) Tab— lets you control the input/output format used when connecting
your GPSMAP 178C to external NMEA devices, a DGPS beacon receiver, a personal computer, another
Garmin GPSMAP 178C, etc. If a DGPS receiver is used, WAAS capability is automatically turned to
‘Off’. The unit supports two input/output ports. See page 96 for more information on wiring and
NMEA information. Individual Port settings are:
Port 1:
• Garmin Data Transfer – the proprietary format used to upload/download MapSource data,
exchange waypoint, route, track, almanac, and proximity data with a PC or another Garmin
GPSMAP 178C. When you select ‘Garmin Data Transfer’, there are 11 Transfer Modes to choose
from: Host, Request Almanac, Request Proximity, Request Routes, Request Tracks, Request
Waypoints, Send Almanac, Send Proximity, Send Routes, Send Tracks and Send Waypoints.
• NMEA In/NMEA Out – supports the input/output of standard NMEA 0183 data and DSC.
• None – provides no interfacing capabilities.
Main Menu—Time Tab
Main Menu—
Comm Tab
Data Transfer Progress
GPSMAP178CManual.indd 86 3/19/2004, 3:10:48 PM