Bedienungsanleitung Navitel Navigator 5.1 PDA (Seite 71 von 74) (Englisch)

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11. Glossary

Accuracy – the parameter which depends on various factors: number of visible satellites, signal qual-

ity, interferences, reflected signals, of the navigator moving speed etc. Most exact readings are

expected when reception is carrying out from more than 4 satellites, uniformly located in the sky,

and the navigator stands still. The accuracy used for calculation of your current coordinates can be

displayed on the screen.

Active route segment — a segment of a route which you are currently move on. Also, this is the

distance between any of the two waypoints in a route.

Almanac — these is the data about the orbit parameters of all the satellites. Each satellite transmits

these data for all others. Unlike the ephemeris data, this data carry a general picture of satellites'

location, and they are valid for several months. The almanac of satellites allows the GPS-receiver to

quickly find and receive the signals from satellites, without performing a cold start.

Autorouting (automatic route navigation) – an important feature of the Software, allowing to produce

a route to the destination point in automatic mode. It means, that it is enough for the user to just

specify the destination point, and the Software will generate the shortest and most convenient route.

To take advantage of the autorouting feature it is necessary to have routable maps.

Azimuth — the heading towards the destination point from the current position, measured in degrees

and counted clockwise from the direction to the North. The azimuth can be graphically displayed on

the PDA screen.

Cold start – is when you switch on the GPS-receiver for the first time, or after it moved far away

from its previous location. In such case the receiver does not have any almanac and ephimeris data,

or these data must be updated. Hence, the GPS-receiver starts loading the almanac, then the

ephimeris. This process takes time — several minutes or more.

Datum – system of coordinates, based on ellipsoid. In such coordinates, when one specifies the lat-

itude and longitude of some point in the area, this is actually referred to as the coordinates of the

projection of this point on the ellipsoid. In different countries, a bit different ellipsoids are used. For

this reason, it is not sufficient to specify the coordinates of some point in order to assess its loca-

tion exactly. It is also needed to specify in what datum these coordinates are set. A wrong datum

can generally lead to errors from 10 m to 1 km. Popular Russian maps, as a rule, are published in

"Pulkovo-1942" coordinates system, while the GPS uses the datum WGS84.

Distance — length (in miles, meters, feet, etc.) between two waypoints, or from your current posi-

tion to a waypoint.

Ephemeris — are the data used for precise correction of orbit parameters and time for each satel-

lite. Each satellites transmits its own data only. These data quickly become outdated. Thus, the

almanac gives to the navigator some general idea about the location of satellites, while the ephimeris

provides very precise information.

Estimated time of arrival — estimated time of the day/night when you will arrive to the next waypoint

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