65ReferenceMain Menu:Comm Tab• GARMIN Remote Sonar— supports the GSD 20 Sonar Module interface.• NMEA In/NMEA Out— supports the input/output of standard NMEA 0183 data, and sonar NMEA inputsupport for the DPT, MTW and VHW sentences.• None— provides no interfacing capabilities.Port 2—• GARMIN Remote Sonar— supports the GSD 20 Sonar Module interface.• GARMIN DGPS— used to connect the GPSMAP 182/182C/232 with a Garmin DGPS beacon receiver.• Other DGPS— allows DGPS input using a standard RTCM format, without any output capabilities.• NMEA In/NMEA Out— supports the input/output of standard NMEA 0183 data, and sonar NMEA inputsupport for the DPT, MTW and VHW sentences. You may also adjust the NMEA output.• RTCM In/NMEA Out— allows Differential GPS (DGPS) input using a standard RTCM format and alsoprovides NMEA 0183 output.• None— provides no interfacing capabilities.To select an input/output format:1. Select the desired Port tab, then highlight the ‘Serial Data Format’ fi eld and press ENTER/MARK.2. Use the ARROW KEYPAD elect the desired setting and press ENTER/MARK.To select a transfer mode:1. Use the ARROW KEYPAD to select ‘GARMIN Data Transfer’ in the ‘Serial Data Format’ fi eld.2. Highlight the ‘Transfer Mode’ field and press ENTER/MARK.3. Use the ARROW KEYPAD to select the desired setting and press ENTER/MARK.You may also adjust the NMEA output to enable/disable certain sentences and adjust the numberof Lat/Lon output precision digits. You must have one of the ports set to NMEA In/NMEA Out to usethis option. Settings will affect both Port 1 and Port 2 NMEA outputs.To adjust the NMEA output:1. From the Comm tab, press MENU, highlight ‘NMEA Setup’ and press ENTER/MARK.2. Highlight the desired option and press ENTER/MARK.3. Use the ARROW KEYPAD to select the desired setting and press ENTER/MARK. Press QUITwhen done to return to the Comm tab.Comm Tab Data TransferProgressWhen transferring databetween two Garmin units,be sure to always set one to‘Host’ and use the other unitto either Send or Requestthe desired data.Advanced NMEAOutput Setup Page