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Prepare to use your CRUX II / GPSJAQ Receiver
To help you begin to use your GPSJAQ, read this User Guide in the first step. The User
Guide explains the detail how the GPSJAQ operates, functions, and common features
of the GPSJAQ. A short glossary of GPS related terms and abbreviations at the back of
the User Guide.
Before you begin using your GPSJAQ, you must complete the GPS/MAP application
software installation tasks in your iPAQTM Pocket PC. For information about the iPAQ
Pocket PC operation and application software installation, please refer to the
documentation that accompanies each product.
For operation detail information, please consult Chapter 3. In order to get more
familiar with your GPSJAQ, please first read Chapter 2 before starting to operate the
GPSJAQ.
GPS signal reception
The Global Positioning System (GPS) is a space-based radio-navigation system. This
system consists of 24 satellites, which orbit the Earth at an altitude of approximately
17,500 kilometers, and ground control stations. Each of the 24 satellites, deployed in
6 orbital planes, circles the earth twice a day. The system satellites continuously
transmit signals contain the information of time and distance in a precise formation,
24 hours a day in any weather condition, everywhere around the world. By processing
the signals received, GPSJAQ provides users with helpful information of position,
velocity, and time for navigation and location awareness purposes anywhere anytime
on the Earth.
The GPSJAQ offers high position accuracy and fast Time-To-First-Fix (TTFF), which rely
on environment circumstances where receiver located as well as initial states of the
receiver. During attempting to a position fix, the receiver needs to lock on to at least
3 satellites and, uses the signal can be received as well as the data of latest position
stored in the receiver’s digital memory in order to compute the location of the device.
Environmental factors that influence the position accuracy and TTFF including such as
tall buildings,
narrow street and passageway,
