Magellan DirectRoute 3.0 Bedienungsanleitung PDF herunterladen (Seite 75)

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GPGGA sentences contain the location and quality of the GPS position fix.

gpvtg option

Read/write GPVTG sentences.

This option tells GPSBabel whether to read (on input) or write (on output) GPVTG sentences. The default

is to read or write GPVTG sentences. To disable GPVTG sentences, specify gpvtg=0.

GPVTG sentences contain information about the heading and the speed at the time of the fix. They do not

contain any location information; for that you will need either or both of GPGGA or GPRMC.

gpgsa option

Read/write GPGSA sentences.

This option tells GPSBabel whether to read (on input) or write (on output) GPGSA sentences. The default

is to read or write GPGSA sentences. To disable GPGSA sentences, specify gpgsa=0.

GPGSA sentences contain information on the quality of the positional fix and the individual satellites from

which it was derived. However, GPSBabel neither reads nor writes the individual satellite data. On input,

the satellite fields are ignored and on output they are left blank.

date option

Complete date-free tracks with given date (YYYYMMDD)..

On input, track points with times but no dates will have this date applied.

This is necessary because some NMEA sentences contain times but no dates. If this option is not specified

and the date cannot be determined from one or more of the available NMEA sentences, the tracks will

be discarded.

get_posn option

Return current position as a waypoint.

This options, when specified, returns the current position as a single waypoint.

pause option

Decimal seconds to pause between groups of strings.

This option tells GPSBabel to pause between individual track records when used on output. This may be

used with appropriate external software or hardware to simulate a GPS receiver for testing purposes. On

Unix, for example, you may use a named pipe to feed the output from GPSBabel to gpsd.

If a value for this option is specified, it is in seconds and it may be either a whole number of seconds or

a fraction (e.g. 0.5 for a 1/2 second pause between trackpoints.)

If this option is specified without a value, the time between adjacent trackpoints will be computed and

used for the length of the pause. That is, if your trackpoints are 5 seconds apart, GPSBabel will pause 5

seconds between trackpoints.

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Magellan DirectRoute 3.0 Bedienungsanleitung Seite 75