Glossary

on this particular day. Using that informa- tion Cydle can change between the day and the night color schemes a few minutes before sunrise and a few minutes after sun- set. As additional information to help your 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.

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 togeth- er with the latitude/longitude position. Note that some older GPS units may provide in- correct 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.

ETA (Estimated Time of Arrival): A fre- quently used expression in navigation. It represents the time when you will reach your destination based upon calculations using the remaining part of the route and available information of the roads used. This estimation can only be used as a gen- eral reference. It will not be able to take into account your future speed or the traf- ﬁc delays. In Cydle this value is shown as ‘Estimated Arrival’ on the Route Informa- tion screen.

ETE (Estimated Time Enroute): Another frequently used expression in navigation. It represents the time needed to reach your destination based upon calculations using the remaining part of the route and avail- able information of the roads used. This estimation can be used only as a general reference. It will not be able to take into ac- count your future speed or the trafﬁc de- lays. In Cydle this value is shown as ‘Time

left’ on the Route Information screen.

GPS: Abbreviation of Global Positioning System. This system is operated by the DoD (the Department of Defense of the Unites States Government). It consists of 24 satellites orbiting Earth, and several ground stations to keep the satellites in sync. To calculate your position, your GPS device uses the signals received from those GPS satellites that are currently visible at your location. You can use this service free of charge.

Lock-on-Road:This function of Cydle will always keep the blue(yellow when using night colors) arrow representing your actu- al position on the nearest road. This auto- matic feature is necessary as the position given by the GPS receiver is not perfectly accurate. Under normal circumstances Lock-on-Road will eliminate the occa- sional position error. If the corridor of error is too large, your position may be shown over a different street on the map. You can only avoid that by using good quality GPS equipment positioned so that it has a direct view to as large a portion of the sky as possible. Normally Lock-on-Road is always active in Cydle when GPS position is available. However for pedestrian use it can be permanently turned off in Advanced settings.

Lock-to-Position:When GPS position is available, Cydle will automatically keep moving the map to always have the blue (yellow at night) arrow, representing your actual position, on the screen. You can move the map to lose this position. Then the Lock button appears on the screen. Tapping it will re-enable Lock-to-Position.

Map Orientation: Cydle is able to ro- tate the map for your convenience. If you choose Track-up mode, the map will be ro- tated to look in the direction of your head-