Garmin eTrex Legend Manuale Utente

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Reference
Setup Pages
Interface Page - Overview
     The Interface Settings Page allows you to choose from 
seven different input/output serial data formats, or, none 
at all. This feature is used when connecting your eTrex 
Legend to external NMEA devices, a DGPS beacon receiver, 
a personal computer, etc. For effective use of this feature it 
is necessary to have a working knowledge of these applica-
tions. Following is a description of each format:
 
  GARMIN - The proprietary format used to exchange 
  waypoint, track, and map data with a PC.
  GARMIN DGPS - Allows DGPS input using a 
  GARMIN beacon receiver and a standard RTCM 
  SC-104 and DGPS tuning.
  NMEA Out  - Supports the output of standard NMEA 
  0183 version 2.3 data.
  Text Out - Allows simple ASCII text output of location 
  and velocity information, without any input capabilities.
  RTCM In - Allows DGPS input using a standard 
  RTCM SC-104 format without any output capabilities.
  RTCM In/NMEA Out- Allows DGPS input using a 
  standard RTCM SC-104 format and supports the 
  output of standard NMEA 0183 version 2.3 data. 
  RTCM In/Text Out- Allows DGPS input using a 
  standard RTCM SC-104 format and simple ASCII text 
  output of location and velocity information. 
  None - Provides no interfacing capabilities.
  If ‘GARMIN DGPS’ or ‘RTCM in/NMEA Out’ format 
is selected, additional fi elds are provided to control a 
GARMIN differential beacon receiver (e.g. GBR 21 & GBR 
23) directly from your unit. Tuning is automatic with 
‘Scan’ or you can enter the beacon frequency and bit rate 
when you select ‘User’ from the Beacon list to manually 
tune the receiver. Refer to the beacon receiver instructions.
Step-by-Step Instructions
  To select a serial data format:
  1.  Highlight the Serial Data Format fi eld and then press 
    in on the CLICK STICK to display options. 
  2. Highlight the desired option and then press in on the 
    CLICK STICK to activate it.
  3. If you selected a format that displays additional fi elds, 
    highlight those with options and make your selection 
    using the CLICK STICK.
GARMIN  Mode 
with No Options
GARMIN  Differential  
GPS Mode 
with Data and Options 
Fields