User manual

This figure depends on the accuracy of your GPS receiver and on current
conditions – for a receiver with SiRF you might be able to use a figure of
0.5kmph, but for a less sophisticated receiver a figure of 2kmph is required.
Setting the Stationary Speed and Heading Samples values
Normally the default settings do not need to be changed, but if you find that the
heading changes when you are stationary, or vice versa, then adjust Stationary
Speed or Heading Samples.
Don’t do this while walking or moving.
Run ViewRanger and connect to the GPS.
Make sure the location bar is displayed. (Settings > UI > View Layout and in
the Map view Display > Show location bar.)
Lock to the GPS by pressing 2 and wait for it to get a position fix. The
coordinates in the location bar will be green and the GPS location cross and
circle on the map will go red (or the colour you have chosen in Settings).
The heading is displayed after the GPS co-ordinates on the second line of the
display with a ‘H:’ prefix. It should either say ‘none’ because ViewRanger has
not detected any movement, or will give a figure in degrees. The symbol ‘=’ after
the heading indicates that the current position is considered stationary.
If the figure is occasionally changing, then either go to Settings > GPS >
Stationary Speed and increase its value (use the # key to enter decimal
points), or increase the Settings > GPS > Heading Samples setting.
Repeat the adjustment until the heading stays constant when the GPS is not
moving.
Don’t use large numbers, values under 3.0km/h should be sufficient – if you
choose 30.0km/h you will need to walk at that speed before the heading
updates.
Maximum Hdop
Your GPS sends ViewRanger a flag indicating whether the GPS considers the
fix is valid, i.e. that it is acceptably accurate. The GPS also sends a numerical
value named ‘Hdop’ indicating the accuracy. A value of 1.0 is near perfect, 10.0
is poor and higher numbers indicate progressively less accurate locations.
When ViewRanger has been told the GPS reading is valid it draws the GPS
circle and cross in red (or the colour you choose in Settings > UI).
Some GPSs say that their fix is no longer valid when the Hdop is more than 10,
others say the fix is invalid when the Hdop is greater than 50. High values like
this are usually undesirable as they indicate an inaccurate reading.
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