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The almanac is stored in the memory of the receiver and is constantly updated, since each
satellite transfers the data of the almanac for the entire group of satellites. The «life» of the
almanac is 2-3 months. Further, the value of the accumulated error in the calculations will
be unacceptable.
Ephemeris data contains options that enable you to calculate the current location of the
satellite more precisely. In contrast to the almanac, each of satellite transmits only its own
ephemeris. The «life» of the ephemeris is 4-6 hours.
Ephemeris and almanac data , transmitted from the satellites, is constantly corrected. This
occures one time per day (if necessary more). Stations network receives data from satel-
lites, analyzes measurments, compares them with reference data, calculates the corrective
amendments and sends them to the main station, where data is transmitted to the satel-
lites.
Starting process, that is necessary for the device to define the position after switching on
depends on the available memory of the initial information. There are the following modes:
”Cold start” time, position, almanac and ephemeris are unknown. This may be due to
the location of the device off for a long time (more than 70 hours) or moving it being off to
a great distance. In this case the device must download the new data on the almanac and
bounds. This process can take more than 20 minutes.
”Warm start” position and ephemeris are unknown, time and the almanac are
known. The device starts collecting data ephemeris, then it will be able to make position
finding. Usually it takes few minutes.
”Hot start the almanac, ephemeris are known, time and a position are known
with some mistakes. This is the fastest kind of system start and it is possible if
the device was switched off for less than 4 hours. Last data is actual except for
small inaccuracies which the system specify in less than 1 minute.
Navitel Navigator is a navigation software developed for a variety of devices equipped with
built-in or external GPS-receivers.
The program allows you to download detailed maps of cities and regions with the house
numbers, street names, metro stations and other useful information. Also the satellite nav-
igation program provides voice-guided navigation. The program is optimized for the stan-
dart screen resolution, it has fast map zooming and scrolling, as well as automatic switch-
ing between maps with various scales.
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