44 GPSMAP 400/500 Series Owner’s ManualConfiguring the Chartplotter7. If you selected Near or Far in step 6, review the placement ofthe Auto Guidance line. Determine whether the line safely avoidsknown obstacles, and whether the turns enable efficient travel.• If the placement of the Auto Guidance line is satisfactory,select MENU > Navigation Options > Stop Navigation.Proceed to step 9.• If the Auto Guidance line is too close to known obstacles,from the Home screen, select Configure > Preferences> Navigation > Auto Guidance > Shoreline Distance >Farthest.• If the turns in the Auto Guidance line are too wide, from theHome screen, select Configure > Preferences > Navigation> Auto Guidance > Shoreline Distance > Nearest.8. If you selected Nearest or Farthest, review the placement of theAuto Guidance line. Determine whether the line safely avoidsknown obstacles, and whether the turns enable efficient travel.9. Repeat steps 1-8 at least once more, using a different destinationeach time, until you are familiar with the functionality of theShoreline Distance setting.Configuring Communications SettingsTo change the communications settings from the Home screen,select Configure > Communications.Serial Port 1—configures the input/output format for serial port 1 touse when connecting your chartplotter to external NMEA devices, acomputer, or other Garmin devices.Serial Port 2 (if supported)—configures the input/output format forserial port 2 to use when connecting your chartplotter to externalNMEA devices, a computer, or other Garmin devices.• garmin data Transfer—supports the input or output ofGarmin-proprietary data for communicating with Garminsoftware.• garmin Remote Sonar Transfer (GPSMAP430/440/530/540/535/545)—supports the input or output ofGarmin-proprietary sonar data for communicating with Garminsoftware.• NMEa Standard—supports the input or output of standardNMEA 0183 data, DSC, and sonar NMEA input support for theDPT, MTW, and VHW sentences.• NMEa High Speed—supports the input or output of standard0183 data for most AIS receivers.NMEa 0183 Setup—enable or disable NMEA 0183 outputsentences for sounder, route, system, and Garmin NMEA settings.