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Here are terms you may see as part of our news and reviews. This glossary provides the definition of the term and puts it into context.

3G Mobile Telephony Protocol
Definition of 3G mobile telephony protocol.

Global Positioning System receivers must have almanac and ephemeris data in memory in order to calculate position. GPS almanac explained.

ANT+ Open Wireless Standard
Definition and description of ANT+ open wireless protocol.

Assisted GPS, A-GPS, AGPS
Assisted GPS, also known as A-GPS or AGPS, enhances the performance of standard GPS in devices connected to the cellular network.

Definition, and information about basemaps included with GPS navigators.

Bearing: the compass direction from your current position to your intended destination

Defintion of Bluetooth, and how Bluetooth works with GPS

Capacitive Touchscreen
A capacitive touchscreen uses a finger's disruption of the electrostatic field to control devices such as the Apple iPod and iPhone.

Definition of coordinates as used in GPS navigation.

EXIF: Exchangeable Image File Format
Definition and description of EXIF, the exchangeable image file format standard.

Fake GPS
As more mobile devices add location-based services, more ways of deteriming users' locations are being introduced. "Fake GPS" simulates the power of the satellite-based global positioning system by other means.

Firmware definition, GPS glossary

Garmin Communicator Plug-in
The free Garmin Communicator plug-in permits Garmin brand GPS units, and many other brands of GPS navigators, exchange data with a Web browser and other programs.

Geocaching is an outdoor adventure game for GPS users

A geocoin is a uniquely numbered object that is hidden in geocache.

A geofence is a virtual boundary around a geographical space.

Geographic Information System (GIS)
A Geographic Information System, or GIS, integrates, data, hardware, software and GPS to assist in the analysis and display of geographically referenced information.

Geotag, Geotagging
Geotag, geotagging

Global Positioning System (GPS)
Global Positioning System

General Packet Radio Service defined.

GPX - GPS Exchange Format defined.

Heading is the direction in which you are currently moving.

KML Keyhole Markup Language
KML File - Keyhole Markup Language definition and uses in digital mapping.

Location-based Service
Definition of location-based service and examples.

Multi-touch Display
The multi-touch display permits fine control of electronic devices. Here's how they work.

Paperless Geocaching
Paperless geocaching defined, and how to use paperless geocaching.

Pedestrian or Walking Mode
Most in-car portable GPS receivers have a pedestrian or walking mode. Here's more on how to access and use the pedestrian mode.

Portable Navigation Device or PND
A portable navigation device, or PND, uses Global Positioning System satellite signals to provide position information and related data and services.

RDS-TMC and RDS-TMC Antenna for In-car Portable GPS Systems
The Traffic Message Channel (TMC) is a technology for providing traffic and travel delay information to drivers. The complementary Radio Data System (RDS) broadcasts digital information carrying TMC updates.

Resistive Touchscreen
How resistive touchscreens work.

SD Card and Micro SD Card
An SD card provides quick upgrades and updates to GPS devices

Definition of text to speech in GPS devices

Time to First Fix (TTFF)
Time to First Fix (TTFF) describes the time and process required for a GPS device to acquire enough usable satellite signals and data to provide accurate navigation.

Topographic Maps
A topographic map shows elevation contour lines, in addition to detailed road, town, and physical characteristics of the landscape.

Travel Bug
Travel bugs are numbered tags that are placed in geoaches as part of the GPS game of geocaching. Users may track travel bugs through www.travelbugs.com.

Trilateration in GPS
Trilateration - Definition of Trilateration in GPS

A waypoint is a reference point, or set of coordinates that precisely identify a location

Wide Area Augmentation System (WAAS)
Wide Area Augmentation System

Wi-Fi Positioning System
Wi-Fi Positioning System is a term pioneered by Skyhook Wireless to describe its Wi-Fi-based location system.

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