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•   Depth—allows you to select the units of measure for depth 

in Feet (ft), Fathoms (fa) or Meters (m).

•   Temperature—allows you to select the units of measure for 

temperature in Fahrenheit (°F) or Celsius (°C).

•   Pressure—allows you to select units of measure for  

pressure in Inches Mercury (in), Millibars (mb), and 

Hectopascals (hPa).

The Time tab shows the current time and date, allows you to adjust 

the 12 or 24 hour time format, enter a time zone, and adjust for 

daylight saving time.
The following options are available:

•   Time Format—choose from 12 Hour, 24 Hour (military), or 

UTC time format.

•   Time Zone—choose your correct time zone to show correct 

local time or select Other.  

•   Daylight Saving Time—choose from Auto, On, or Off to 

adjust for daylight saving time.

The Comm tab controls the input/output format used when 

connecting your GPSMAP 392/398/492/498 to external NMEA 

devices, a PC, or another Garmin unit. 

•   Garmin Data Transfer—the proprietary format used to 

upload or download MapSource data, exchange waypoint, 

route, track, almanac, and proximity data with a PC or 

another Garmin unit. When you select Garmin Data Transfer, 

you can choose from 11 Transfer Modes: Host, Request 

Almanac, Request Proximity, Request Routes, Request 

Tracks, Request Waypoints, Send Almanac, Send Proximity, 

Send Routes, Send Tracks, and Send Waypoints.

•   Garmin Remote Sonar—required for use with the GSD 22, 

GSD 21, or GSD 20.

•   NMEA In/NMEA Out—supports the input/output of 

standard NMEA 0183 data, and sonar NMEA input support 

for the DPT, MTW and VHW sentences. 

•   None—provides no interfacing capabilities.