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  2. GPS tracking unit - Wikipedia

    en.wikipedia.org/wiki/GPS_tracking_unit

    GPS antenna size limits tracker size, often smaller than a half-dollar (diameter 30.61 mm). In 2020 tracking is a $2 billion business plus military-in the gulf war 10% or more targets used trackers. Virtually every cellphone tracks its movements. Tracks can be map displayed in real time, using GPS tracking software and devices with GPS ...

  3. Texas land survey system - Wikipedia

    en.wikipedia.org/wiki/Texas_land_survey_system

    State boundary; Railroad district (12 total, county boundaries) County; In Texas, the highest level of land subdivision is the boundary of the state itself. Below this are the Texas railroad districts, of which there are 12. These are Spanish grants, surveyed on the "metes and bounds" system of measurement, and are of irregular shape and size.

  4. Real-time locating system - Wikipedia

    en.wikipedia.org/wiki/Real-time_locating_system

    Fingerprinting is a way to overcome the visibility issue: If the locations in the tracking area contain distinct measurement fingerprints, line of sight is not necessarily needed. For example, if each location contains a unique combination of signal strength readings from transmitters, the location system will function properly.

  5. Stingray phone tracker - Wikipedia

    en.wikipedia.org/wiki/Stingray_phone_tracker

    Then, the vehicle moves to another location and sends out signals until it connects with the phone. When the signal strength is determined from enough locations, the computer system centralizes the phone and is able to find it. Cell phones are programmed to constantly search for the strongest signal emitted from cell phone towers in the area.

  6. List of principal and guide meridians and base lines of the ...

    en.wikipedia.org/wiki/List_of_principal_and...

    Primarily from the United States Government Printing Office Style Manual. [1] State names usually signify only parts of each listed state, unless otherwise indicated. Based on the BLM manual's 1973 publication date, and the reference to Clarke's Spheroid of 1866 in section 2-82, coordinates appear to be in the NAD27 datum.

  7. Comparison of free off-line satellite navigation software

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

    Some of the free software mentioned here does not have detailed maps (or maps at all) or the ability to follow streets or type in street names (no geocoding). However, in many cases, it is also that which makes the program free (and sometimes open source [ 1 ] ), avoid the need of an Internet connection, [ 2 ] [ 3 ] [ 4 ] and make it very ...

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