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I just went through solving this problem. The post by AndreJ is accurate and helped to start my investigation as to why the system clock was so far off. In my case, I'm connecting a GPS receiver to a Raspberry Pi 2 running Ubuntu 14.04. Raspberry Pis don't have hardware clocks and so early in the boot process, before ntp can set the clock, the time/date are ...


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This seems to be a known system/software bug: http://forums.gpsreview.net/discussion/29425/garmin-gps-iii-plus-date-problem http://continuouswave.com/ubb/Forum6/HTML/002815.html http://www.colorado.edu/geography/gcraft/notes/gps/gpseow.htm and from the gpsd manpage http://www.catb.org/gpsd/gpsd.html: There are exactly two circumstances under which ...


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Only vector points/lines can be uploaded on a GPS unit transform polygons into lines using Vector – geometric tools – polygons to lines Convert .shp layer into a .gpx layer (GPX is a default format for GPS) the names of the points/lines of your layer must be listed in a column called “name” in the attribute table of the .shp file. GPS won’t recognize ...


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You cannot get PDOP from HDOP. PDOP brings in a vertical dimension (VDOP) which is rarely made available separately. Your options are: to calculate it yourself from the geometry at the time (i.e. if you know which satellites were in solution at any given time; and you know the resulting position; you could derive it). make some assumptions which are ...


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This is simple technique you should use com.esri.core.geometry.Point class for converting your GPS lat and lng into ArcGIS map point. For Example: private Point ConvertMyLocationPoint(final double x, final double y) { Point wgspoint = new Point(x, y); Point mapPoint = (Point) GeometryEngine.project(wgspoint, SpatialReference.create(4326), ...



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