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Automatic day/night colours: Based on the time and position given by the GPS
device, Uniden Navigation is able to calculate when the sun rises and sets at your current
location on this particular day. Using that information Uniden Navigation can change
between the day and the night colour schemes a few minutes before sunrise and a
few minutes after sunset (Page 55). As additional information to help your orientation,
the sun is shown in the sky when you display the map in 3D mode with a low viewing
angle, and the sun is near the horizon.
Baud rate: The speed of the communication between the GPS receiver and the PDA
can be set in Bauds, representing the number of signal events per second. Usual
values for GPS devices are 4800, 9600, 19200, 38400 and 57600. See also Page .
Elevation: When the GPS receiver can see at least four GPS satellites, it can
determine its current position in three dimensions. In this case the elevation is
calculated together with the latitude/longitude position. Note that some older GPS
units may provide incorrect elevation data because they use a simple ellipsoidal earth
model rather than a database that contains local sea levels. You should also be
aware that the elevation value is generally less accurate (by at least a factor of 2)
than the horizontal position. See also 2D/3D GPS Reception.
ETA (Estimated Time of Arrival): A frequently used expression in navigation. It
represents the time when you will reach your destination based upon calculations
using the remaining part of the route and available information of the roads used. This
estimation can only be used as a general reference. It will not be able to take into
account your future speed or the trafc delays. In Uniden Navigation this value is shown as
‘Estimated Arrival’ on the Route Information screen (Page 40).
ETE (Estimated Time Enroute): Another frequently used expression in navigation.
It represents the time needed to reach your destination based upon calculations
using the remaining part of the route and available information of the roads used. This
estimation can be used only as a general reference. It will not be able to take into
account your future speed or the trafc delays. In Uniden Navigation this value is
shown as ‘Time left’ on the Route Information screen (Page 39).
GPS: Abbreviation of Global Positioning System. This system is operated by the
DoD (the Department of Defense of the Unites States Government). It consists of 24
satellites orbiting Earth, and several ground stations to keep the satellites in sync. To
calculate your position, your GPS device uses the signals received from those GPS
satellites that are currently visible at your location. You can use this service free of
charge.
Lock-on-Road: This function of Uniden Navigation will always keep the blue
(yellow at night) arrow representing your actual position on the nearest road. This
automatic feature is necessary as the position given by the GPS receiver is not perfectly
accurate. Under normal circumstances Lock-on-Road will eliminate the occasional
position error. If the corridor of error is too large, your position may be shown over a
different street on the map. You can only avoid that by using good quality GPS
equipment positioned so that it has a direct view to as large a portion of the sky as
possible. Normally Lock-on-Road is always active in Uniden Navigation when GPS
position is available. See also in Page 23. However for pedestrian use it can be
permanently turned off in Advanced settings (Page 70).