Frequently Asked Questions
Why should I rent a
have any units for sale?
do you deliver the unit and how is it returned?
What do our customers have to say about
What is GPS?
How accurate is GPS?
How does GPS work?
Why should I rent a
GPS? GPS rental is not for everyone.
We realize that buying a GPS is the answer for some people.
Rental is is an ideal solution if
lare an occasional user ($12 for 3 days)
- want the GPS with all your destinations already entered ahead of time
dont want to have to update maps or
need maps of other regions outside of North
want to always have some of the latest
want to try before you buy
Do you have any units for
sale? Durham GPS is mainly a GPS
rental business but occasionally we may have some used units
for sale. These are fully functional units with updated maps.
Give us a call at (800)585-8510
you deliver the unit and how is it returned?
We will arrange for
delivery anywhere in the GTA or major cities in Canada through
Canada Post for a flat fee of $12.00 return unless your
rental fee exceeds $45 in which case the fee is
waived. This amount will be added to
your invoice unless you wish to pick up and drop off the unit
at our Whitby location. The unit will be sent using Expedited
Parcel which is a next day service in the GTA and 2-4 days to
other major Canadian cities. You will be provided with a
prepaid postage label for the return trip. Simply drop the
unit off at any Canada Post outlet. The rental contract period
will not include delivery time.
GPS? The Global
Positioning System (GPS) is a satellite-based navigation
system made up of a network of 24 satellites placed into orbit
by the U.S. Department of Defense. GPS was originally intended
for military applications, but the government eventually made
the system available for civilian use. GPS works in any
weather conditions, anywhere in the world, 24 hours a day.
There are no subscription fees or setup charges to use the
basic GPS navigation service. The new traffic information
feature is a subscription based service within North America
but free in Europe.
Back to Top
is GPS? Today's GPS receivers are
extremely accurate, thanks to their parallel multi-channel
design. Our systems have 12 parallel channel receivers which
are quick to lock onto satellites when first turned on and
they maintain strong locks, even in dense foliage or urban
settings with tall buildings. Certain atmospheric factors and
other sources of error can affect the accuracy of GPS
Back to Top
How does GPS
work? GPS satellites
circle the earth twice a day in a very precise orbit and
transmit signal information to earth. GPS receivers take this
information and use triangulation to calculate the user's
exact location. Essentially, the GPS receiver compares the
time a signal was transmitted by a satellite with the time it
was received. The time difference tells the GPS receiver how
far away the satellite is. Now, with distance measurements
from a few more satellites, the receiver can determine the
user's position and display it on the unit's electronic map. A
GPS receiver must be locked on to the signal of at least three
satellites to calculate a 2D position (latitude and longitude)
and track movement. With four or more satellites in view, the
receiver can determine the user's 3D position (latitude,
longitude and altitude). Once the user's position has been
determined, the GPS unit can calculate other information, such
as speed, bearing, track, trip distance, distance to
destination, sunrise and sunset time and more.