Garmin GPSMAP 238 Sounder User Manual download pdf (Page 100)

Reference

Main Menu: Comm Tab/

Alarm Tab

Advanced NMEA Output Setup

The GPSMAP 188/188C/238 Sounder NMEA data transmission can be customized to change the

precision of the Lat/Lon minutes, set up the waypoint IDs, and keep the output rate at two seconds. If

the unit is set up to output all of the available NMEA sentences, the output rate may exceed two sec-

onds. The ‘Advanced NMEA Output Setup’ page allows you to turn on/off the GPS status (GSA. GSV),

Waypoint/Route (WPL, RTE), and the Garmin Proprietary sentences. See page 95 for more information

on wiring and NMEA data.

Lat/Lon Minutes Precision allows you to adjust the number of digits to the right of the decimal

point for transmission of NMEA Output, either 2, 3 or 4 digits. The Waypoint ID setting lets you

choose to output the waypoint identiﬁ ers as names or numbers.

To set up the Advanced NMEA page:

1. Highlight ‘NMEA In/NMEA Out’ in the Serial Data Format ﬁ eld, and press MENU. Select ‘NMEA

Setup’ and press ENTER.

2. To change the settings, place the highlight over the desired ﬁ eld and press ENTER. Make a

selection and press ENTER again to accept the selection.

GPSMAP 188/188C/238 Sounder NMEA Sentence Output (NMEA version 2.3 compliant)

Always transmitted: GPRMC, GPGGA, GPGLL, GPBWC, GPVTG, GPXTE, GPRMB

Switchable sentences: GPGSA, GPGSV, GPWPL, GPRTE

Garmin proprietary: PGRME, PGRMZ, PGRMM

Alarm Tab— contains setting for the unit’s alarms. The Alarm tab is divided into three submenus:

System alarms, Nav alarms, and Sonar alarms.

System Tab

Clock – provides an alarm for the system clock. Enter a time in the time ﬁ eld and turn the alarm on

and off from the control ﬁ eld menu. Remember to enter alarm times in the same time format (UTC

or local) you’re using for your system. The unit must be on for the clock alarm to work.

Advanced NMEA

Setup Page

Main Menu—Alarm Tab

(System Submenu)

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Garmin GPSMAP 238 Sounder User Manual Page 100