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  1. The use of GPS devices and smartphones as navigation aids. Over the last decade, the use of GPS (Global Positioning System) devices has become common to aid navigation on the hills, whilst over the last couple of years many Smartphones equipped with GPS technology have been used for the same purpose.

  2. Apr 18, 2018 · points out that surveyors need no longer climb to the highest points of area landscapes or measure short distances at a time due to obstacles such as trees or hills, but only need have a clear view of the sky. The time it takes to complete a job using GPS can be as little as a tenth of the time the job took before this technology was ...

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  4. Jun 08, 2016 · > GPS will do the job it is designed to – computing our exact position GNSS may not compute your exact position in locations where there are large reflective and obscuring elements. This is true in both mountainous and high-rise urban environments. The term 'urban canyon' is often used in the GNSS field, and is an active field of research.

  5. Most GPS devices have an accuracy of 3 to 5 meters. “Most distance discrepancies come from small accumulated errors,” said Anna Johnson, chief technical officer and co-founder at Gaia, a subscription-based app popular with hikers. “Imagine if every other GPS point taken is off 5 feet to the left or right of your actual position.

  6. May 25, 2010 · Types of sport devices GPS based altimeters: The most common type of altimeter found in consumer grade fitness devices today is one based on GPS coordinates. This includes units such as the Garmin Forerunner series (305/405/310XT/110), but this doesn’t include most of the Edge based series, which I’ll talk about in the next section.

  7. Jul 19, 2015 · The GPS receiver uses a theoretical sea level estimated by a World Geodetic System (WGS84) ellipsoid, which does not perfectly follow the theoretical MSL. The MSL, approximated by an ellipsoid, is related to gravity or the center of mass of the earth. Discrepancies between a WGS84 ellipsoid, and the geoid vary with location.

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