Acquisition time

The time it takes for a GPS receiver, upon power-up, to acquire enough satellites for the GPS receiver to compute a position.

Geofence

A geofence is a boundary defined around a location or area on the Earth's surface. The current position of an asset (typically obtained using GPS) is compared with the boundary and an alert is triggered on entry or exit. A geofence may be a simple circle defined by a centre coordinate and radius, or a more complex shape defined by vertices of a polygon or a series of circular arcs.

GMT (Greenwich Mean Time)

GMT is a legacy version of UTC time (Coordinated Universal Time). It is the zero-point reference when referring to time zones. Also referred to as Zulu time.

GPRS - General Packet Radio Service

Refers to a packet-based wireless communication service that promises data rates from 56 up to 114 Kbps and continuous connection to the Internet for wireless phone and mobile computer users.

GPS - Global Positioning System

A radio navigation technology, based on the satellite system operated and owned by the U.S. Dept. of Defense. GPS can be used to determine the current latitude, longitude, and elevation of a GPS receiver anywhere on the Earth.

Latitude/Longitude

A system of equatorial and meridian lines that comprise a coordinate system from which one can locate unique geographic positions on the Earth.

M2M - Machine to Machine

M2M is the ability of machines, assets and devices to exchange data with people or company's management systems in need of the information. M2M is derived from telemetry technology and uses similar, but updated versions of those technologies. Today's cellular M2M technology uses field-deployed wireless device a wireless carrier network and a back-end server network. In some instances M2M is used to mean Machine-to-Man or Mobile-to-Mobile.

OBD - On-board Diagnostics

OBD, in an automotive context, is a generic term referring to a vehicle's self-diagnostic and reporting capability. OBD systems give the vehicle owner or a repair technician access to state of health information for various vehicle sub-systems. The OBD-II specification provides for a standardized hardware interface—the female 16-pin (2x8) J1962 connector.

Track log

Synonymous to a “bread-crumb” trail of where you’ve traveled based on how often you’ve set the GPS receiver to record.

Vehicle Tracking System

A vehicle tracking system is an electronic device installed in a vehicle to enable the owner or a third party to track the vehicle's location.

Credits:
http://www.m2mpremier.com/Technology_glossary.aspx
http://en.wiktionary.org/wiki/Wiktionary:Main_Page
http://www.gpsmaniac.com/gpsmaniac/GPS-Glossary/static/detail/413603
http://en.wikipedia.org/wiki/Main_Page