Interface SettingsFormat lets you control the input/output format used when connecting your GPS III toexternal NMEA devices, a DGPS beacon receiver, a personal computer, etc. Five formatsettings are available:• GARMIN — the proprietary format used to exchange waypoint, route, track logdata with a PC or with another GPS III.• NMEA — supports the input/output of standard NMEA 0183 version 2.0 data.• None — provides no interfacing capabilities.• RTCM/NMEA — allows Differential GPS (DGPS) input using a standard RTCMformat and also provides NMEA 0183 version 2.0 output.• RTCM In — allows DGPS input using a standard RTCM format, without anyoutput capabilities.To select an input/output format:1. Highlight the ‘Format’ field and press ENTER.2. Select the desired setting and press ENTER.3. If the ‘GARMIN’ format is selected, highlight the ‘Transfer Mode’ field and press ENTER. Selectthe desired setting and press ENTER. The ‘Transfer Mode’ field allows you to specify what infor-mation to request or send to a second GPS III. The ‘Host’ setting lets you control all data transferfunctions from the second GPS III or from a PC.4. If an ‘RTCM’ format is selected, additional fields are provided to control a GARMIN GBR 21 bea-con receiver directly from your GPS III. You can enter the beacon frequency and bit rate on theGPS III and the information will be used to tune the beacon receiver. For more information, referto the owner’s manual for the GBR 21.The ‘GARMIN’ option allowsthe GPS III to exchange datawith a PC or another GPS III.Use this setting with theoptional PC Software Kit.Select the ‘RTCM/NMEA’option to use the GPS IIIalong with a GBR 21Differential Beacon Receiver.75REFERENCESetup Menu: Interface