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  2. Radar - Wikipedia

    en.wikipedia.org/wiki/Radar

    Radar is a system that uses radio waves to determine the distance (), direction (azimuth and elevation angles), and radial velocity of objects relative to the site. It is a radiodetermination method [1] used to detect and track aircraft, ships, spacecraft, guided missiles, motor vehicles, map weather formations, and terrain.

  3. Comparison of web map services - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_web_map_services

    Directions Feature Google Maps Bing Maps MapQuest Mapy.cz OpenStreetMap Here WeGo Apple Maps Yandex Maps; Directions Yes Yes Yes Yes Yes [14] Yes – by car, foot, public transport Yes Yes Reverse directions Yes Yes Yes Yes Yes, third-party [15] Yes Yes Yes Public transport integration Yes, limited to certain areas Yes, limited to certain areas ...

  4. Over-the-horizon radar - Wikipedia

    en.wikipedia.org/wiki/Over-the-horizon_radar

    MADRE over-the-horizon radar at the NRL's Chesapeake Bay Detachment U.S. Navy Relocatable Over-the-Horizon Radar station. The most common type of OTH radar, OTH-B (backscatter), [3] uses skywave or "skip" propagation, in which shortwave radio waves are refracted off an ionized layer in the atmosphere, the ionosphere, and return to Earth some distance away.

  5. Radar horizon - Wikipedia

    en.wikipedia.org/wiki/Radar_horizon

    Below 3 MHz, the whole volume of the air acts as a waveguide to fill in the radar shadow and also reduces radar sensitivity above the duct zone. Ducting fills in the shadow zone, extends the distance of the clutter zone, and can create reflections for low PRF radar that are beyond the instrumented range.

  6. Radar navigation - Wikipedia

    en.wikipedia.org/wiki/Radar_navigation

    Radar ranges and bearings can be very useful for navigation. Radar navigation is the utilization of marine and aviation radar systems for vessel and aircraft navigation.When a craft is within radar range of land or special radar aids to navigation, the navigator can take distances and angular bearings to charted objects and use these to establish arcs of position and lines of position on a ...

  7. MapQuest - AOL Help

    help.aol.com/products/mapquest

    MapQuest offers online, mobile, business and developer solutions that help people discover and explore where they would like to go, how to get there and what to do along the way and at your destination.