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How Lowrance GPS and the GPS System Work
You will navigate a little easier if you understand the basics of how the
iWAY scans the sky to show you where you are and where you are go-
ing. If you already understand GPS receivers and the GPS system, skip
ahead to Section 1, Installation & Accessories on page 3.
Think of your iWAY as a small, highly automated, computer. The iWAY is
controlled by a touch screen with menu displays so you can direct its func-
tions. As long as there is no interference, and the unit is locked on to a sat-
ellite signal, it will display your location on a moving map and help guide
you to your destination. A built-in speaker allows you to hear verbal turn-
by-turn driving instructions and listen to MP3 music files.
The internal antenna tunes in to a couple of dozen GPS and WAAS sat-
ellites circling the earth. Your unit listens to signals from as many sat-
ellites as it can "see" above the horizon, then computes its location in
relation to those satellites. The iWAY plots your position on the map
displayed on the screen.
The iWAY's hard drive contains highly detailed road and highway
mapping data for Hawaii, the 48 contiguous United States and most of
Canada. You can not change or erase the map. The iWAY's memory
also records GPS data you create, such as address book contacts.
GPS stands for Global Positioning System, a navigational system that
can accurately locate your position almost anywhere. This technology is
available to everyone, everywhere, 24 hours a day, in all weather condi-
tions. GPS uses 24 satellites orbiting 10,900 miles above the Earth to
transmit position data back to Earth. A GPS receiver processes that
data to tell you where you are.
For the system to work, the unit must have a clear view of the satellites
in order to receive the signals. Unlike radio or television signals, GPS
works at very high frequencies. These signals can be easily blocked by
trees, buildings, an automobile roof, even your body.
If you would like to know more about GPS and its companion system
WAAS, visit our web site and check out the GPS Product Guide section
(www.lowrance.com/Support/gps.asp). It includes a GPS tutorial, fre-
quently asked questions and a glossary.
NOTE:
The iWAY is controlled using a pressure-sensitive touch screen. In
this manual, the touch screen "keystrokes" appear as boldface type. If
you are in a hurry when you are looking up instructions (or if you just
need a reminder), you can skim the instructions and pick out what
menu command to use by finding the boldface command text.