(Global Positioning System)
What is a GPS?
A. A GPS (Global Positioning Satellite) receiver accepts
data from satellites circumnavigating the globe to triangulate your
location on Earth in longitudinal and latitudinal co-ordinates.
The more satellites a GPS acquires, the more accurate your position.
Older model GPS units had a maximum of 8 channels to receive satellite
information whereas today’s GPS units receive up to 12 channels
of information. A basic GPS will be able to pin-point your location
within an EPE (Estimated Positional Error) of 3-4 metres.
What is a waypoint?
A. A waypoint is a location you mark on the map of a GPS
to be referred to at any time as a favourite destination. You may
only mark your current position as waypoint once you have acquired
satellites. You may however mark any spot as a waypoint by finding
it manually on the map page or by entering it the longitude and
What is the difference between a route and a track?
A. A route is created by using existing waypoints or any
specific points on the map. These points are then set up in a specific
order from one point to the next. On some GPS devices with Autorouting
capabilities, along with routable software programs, the device
will automatically calculate a route to get from its current location
to a specific point. A track is a "bread crumb" trail
on the map of all movements until the track is saved or cleared.
A track will begin to create after the GPS device acquires satellites
and the device begins to move around.
Can I calculate area on my GPS?
A. Some handheld and fixed mounted GPS units within the
Garmin range can calculate area. This is generally done by clearing
the track log and ensuring track recording is on, setting a starting
waypoint, circumnavigating the area back to the start, saving the
track and reviewing the details of that track. To see whether your
model GPS calculates area, please refer to the specifications page
of your unit on Garmin’s website at www.garmin.com.
What are POI’s and custom POI’s?
A. POI’s (Points Of Interest) can be any destination
of interest such as museums, airports, hotels, businesses, tidal
stations, wrecks, beacons, buoys etc and are generally included
on the appropriate mapping product. Custom POI’s can consist
of any user programmable destination to be loaded onto a mapping
GPS unit. Custom POI’s of interest such as red-light cameras,
fixed speed cameras and school zones may be downloaded onto a street
navigation unit for added safe travelling. Sample data for Australia
may be downloaded from GME’s website at www.gme.net.au.
Can I change my vehicle icon on my street navigation unit?
A. Customisable vehicle icon may be changed on any of Garmin’s
street navigation unit to spice up the look of your unit. Vehicle
icons range from dirtbikes, buggys, santa’s sleigh, snow mobiles,
flaming cars, stockcars and tanks etc. For a complete list of customisable
vehicle icons, visit Garmin’s website at www.garmin.com.
How do I update my unit?
Software updates such as firmware (a GPS’s operating system),
languages, voices, satellite receiver software and Bluetooth updates
are available by downloading and executing the WebUpdater program
from the Support section of Garmin’s website. Mapping updates
are ordered via Garmin’s website once your unit has been registered
in the MyGarmin section.
What is WAAS?
A. WAAS stands for Wide Area Augmentation System and consists
of approximately 25 ground reference stations positioned across
the United States that monitor GPS satellite data. Two master stations
located on either coast collect data from the reference stations
and create a GPS correction message. This correction accounts for
GPS satellite orbit, clock drift and signal delays caused by the
atmosphere and ionosphere. The corrected differential message is
then broadcasted through one of two geostationary satellites (meaning
they don't orbit the earth like regular GPS satellites). This information
is compatible with the basic GPS signal structure, which means any
WAAS-enabled GPS receiver can read the signal and therefore apply
the corrections. WAAS is only of use in the northern hemisphere.
What is a MOB?
A. MOB (Man OverBoard) is a feature of some GPS units to
immediately mark a waypoint on a map while travelling at speed.