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2. Comparison of free off-line satellite navigation software

   en.wikipedia.org/wiki/Comparison_of_free_off...

   Comparison of free off-line satellite navigation software. This article contains a list with gratis (but not necessarily open source) satellite navigation (or "GPS") software for a range of devices (PC, laptop, tablet PC, mobile phone, handheld PC (Pocket PC, Palm)). Some of the free software mentioned here does not have detailed maps (or maps ...

3. The 9 Best Hiking GPS Devices - AOL

   www.aol.com/lifestyle/9-best-hiking-gps-devices...

   See where you are and where you want to go with these expert-approved handheld GPS devices, GPS watches, and apps, from Garmin, Suunto, Gaia, and Caltopo.

4. List of cameras which provide geotagging - Wikipedia

   en.wikipedia.org/wiki/List_of_cameras_which...

   External (RS-232C interface to a GPS receiver, such as Garmin GPS III, Garmin GPS III Plus, Garmin eTrek, Magellan ColorTrack, Magellan MAP 315 or Magellan MAP 330) Nikon D5

5. International Terrestrial Reference System and Frame

   en.wikipedia.org/wiki/International_Terrestrial...

   The ITRS defines a geocentric system of coordinates using the SI system of measurement. An International Terrestrial Reference Frame ( ITRF) is a realization of the ITRS. Its origin is at the center of mass of the whole earth including the oceans and atmosphere. New ITRF solutions are produced every few years, using the latest mathematical and ...

6. GNSS applications - Wikipedia

   en.wikipedia.org/wiki/GNSS_applications

   GNSS applications. Global Navigation Satellite System (GNSS) receivers, using the GPS, GLONASS, Galileo or BeiDou system, are used in many applications. The first systems were developed in the 20th century, mainly to help military personnel find their way, but location awareness soon found many civilian applications.

7. Earth-centered, Earth-fixed coordinate system - Wikipedia

   en.wikipedia.org/wiki/Earth-centered,_Earth...

   The Earth-centered, Earth-fixed coordinate system (acronym ECEF ), also known as the geocentric coordinate system, is a cartesian spatial reference system that represents locations in the vicinity of the Earth (including its surface, interior, atmosphere, and surrounding outer space) as X, Y, and Z measurements from its center of mass.