HP 914c - iPAQ Business Messenger Smartphone Navigation Manual page 121

Automatic route planning (Autorouting): You only need to set up your
destination, and based on its map, the software will automatically figure out which
roads you need to take, and the turns you need to make to get there. HP iPAQ Trip
Guide will let you select multiple destinations, and customise some important routing
parameters (Page 85).
Automatic route recalculation: If this function is enabled (Page 8 ), HP iPAQ 0
Trip Guide recalculates your route if you deviate from it. When you miss a turn or
avoid a roadblock, HP iPAQ Trip Guide waits for a few seconds to be sure you do not
follow the route any more (you can fine-tune it in Advanced settings), then recalculates
the route based upon your new position and heading.
Automatic day/night colours: Based on the time and position given by the GPS
device, HP iPAQ Trip Guide is able to calculate when the sun rises and sets at your
current location on this particular day. Using that information HP iPAQ Trip Guide can
change between the day and the night colour schemes a few minutes before sunrise
and a few minutes after sunset (Page 7 ). As additional information to help your 8
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.
Communication port: A communication channel in the PDA device, through which
the data from the GPS is received. The GPS will connect to one of the serial ports
(COM ports).
Communication protocol: GPS devices can send data using different 'languages'.
The one built into almost all GPS devices is the NMEA 0183 format. HP iPAQ Trip
Guide can receive in that format or in one of the most popular alternative formats:
SiRF.
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.
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