4 Locating
Page 27 of 33
4.9 GPS
GPS is a factory fit option that must be requested at the time of ordering.
The function of the GPS feature is to attach positional information to any recorded logs. The process is
automatic and does not require further interaction from the operator. The accuracy of the data will vary
depending on satellite availability and quality of satellite signal. Satellite availability will vary throughout the
day but should be adequate at all times. Things that can affect the quality of signal are:
Working in built up areas. This causes the signal to bounce off buildings and creates errors. Working
close to high rise buildings for instance will affect the signal more than low buildings.
Dense overhead foliage such as large tree branches.
With good satellite reception, a 5m or better accuracy should be possible in the majority of instances.
For positional information to be attached to records a valid GPS signal must be detected. If no GPS data is
being detected the record will still be logged but without GPS data.
If the GPS option is fitted, a GPS icon will appear on the screen. The condition of the GPS signal can be
determined as below:
No GPS icon = GPS not fitted
Flashing icon = GPS not receiving a valid signal. Looking for satellites.
Solid icon = valid GPS signal detected.
NOTE
Note that when the unit is switched on the GPS icon may flash for a prolonged
time as the GPS circuitry takes time to acquire satellites. This time will vary
depending on satellite availability. The first time the unit is switched on it may
take up to five minutes to detect a valid signal, but subsequent times should be
much less.
Note that there will be no satellite access within buildings.
The vScan has quick start up circuitry for the GPS. It works by holding power to the GPS circuitry for a period
of 30 minutes (or as set by MyvScan) after switch off. If the unit is switched back on within the 30 minute time
period and providing there is GPS availability, the GPS lock will be almost instant.
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