Glossary - HP 914c - iPAQ Business Messenger Smartphone Navigation Manual

Glossary

The manual may contain many technical terms. Please look below for an explanation
if you are unfamiliar with some of them.
2D/3D GPS reception: The GPS receiver uses satellite signals to calculate its (your)
position. Depending on the current positions of the ever moving satellites in the sky,
and the objects in your environment, the signal that your GPS device receives may be
weaker or stronger. Your GPS needs strong signal from at least four satellites to give a
three dimensional position including elevation. If fewer satellites are available, it may
still be possible to calculate the position but the accuracy will be lower and the GPS
device will not calculate elevation. This is called 2D reception. HP iPAQ Trip Guide
shows the quality of reception on the Main menu (Page 2 ), the GPS Data screen 2
(Page 36) and both map screens (Page 4 ). Note that 2D and 3D GPS receptions 5
have nothing to do with the 2D and 3D display modes of the map. That is a way of
representing the map on the screen independently from the GPS reception.
Accuracy: The difference between your real position and the one given by the GPS
device is affected by several different factors. The GPS is capable of providing a
guess of its current error based on the number of satellites it can receive a signal from,
and their position in the sky. This information is shown in HP iPAQ Trip Guide on the
GPS Data screen (Page 3 ). Use it as a general reference only. Note that several 6
other factors affect the real accuracy, some of which the GPS is incapable of
estimating (e.g. signal delay in the ionosphere, reflecting objects near the GPS device,
etc.).
Active route: A route is an itinerary planned to reach your chosen destinations. A
route is active when it is used for navigation. HP iPAQ Trip Guide has only one route
at a time, and it is always active until you delete it, reach the final destination or exit
HP iPAQ Trip Guide. When there is more than one destination to reach, the route is
cut into different legs (from one via point to another). Only one of these legs can be
active at one particular time. The rest of them are unused and shown in a different
colour on the map.
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