Configuring Communications Settings - Garmin GPSMAP 640 Owner's Manual

Position Format—select the coordinate system in which a given
location reading appears. Do not change the position format unless
you are using a map or chart that specifies a different position
format.
Map Datum—select the coordinate system in which the map is
structured. The default setting is WGS 84. Do not change the map
datum unless you are using a map or chart that specifies a different
position format.
time—change time settings.
• time Format—set the time format (12 hour, 24 hour, or UTC)
for time readings.
• time Zone—set the time zone displayed for time readings.

Configuring Communications Settings

Configure
From the Home screen, touch
Port types—select the input/output format
transfer, NMea Std. or NMea High
use when connecting your unit to external NMEA devices, to a
computer, or to other Garmin devices.
• Garmin Data transfer—a proprietary data transfer protocol
that is used to interface with Garmin computer programs.
• NMea Std.—supports the input or output of standard NMEA
GPSMAP 640 Owner's Manual
> Communications.
(Garmin Data
Speed) for each port to
0183 data, DSC, and sonar NMEA input support for the DPT,
MTW, and VHW sentences.
• NMea High Speed—supports the input or output of high
speed NMEA 0183 data for most AIS receivers.
NMea Setup—enable or disable NMEA 0183 output for route
sentences and system sentences, and adjust Garmin NMEA
settings.
• Posn. Precision—adjust the number of digits
three Digits, or Four Digits) to the right of the decimal point
for transmission of NMEA output.
• Waypoint iDs—select how the unit outputs waypoint identifiers
or Numbers).
(Names
• Diagnostics—a tool used by installers to verify that
NMEA 0183 data is being sent across the system.
Enabling or Disabling NMEA 0183 Output
Sentences
1. From the Home screen, touch
NMEA 0183 Setup.
2. Touch a setting (Route, System, or Garmin).
3. Touch the NMEA output sentence.
4. Touch Off to disable, or touch
output sentence.
Marine Mode: Advanced Configuration
(two Digits,
Configure > Communications
On to enable, the NMEA 0183
>