4
How Your GPS Works
You'll navigate faster and easier if you understand how this unit scans
the sky to tell you where you are on the earth — and, where you're
going. (But if you already have a working understanding of GPS
receivers and the GPS navigation system, skip on ahead to Section 2,
Installation & Accessories on page 9. If you're new to GPS, read on, and
you can later impress your friends with your newfound knowledge.)
First, think of your unit as a small but powerful computer. (But don't worry
— we made the series easy to use, so you don't need to be a computer expert
to find your way!) The unit includes a keypad and a screen with menus so
you can tell it what to do. The screen also lets the unit show your location on
a moving map, as well as point the way to your destination.
This gimbal-mounted unit uses an external antenna/receiver module,
which makes the whole system work something like your car radio.
However, instead of your favorite dance tunes, this receiver tunes in to
a dozen GPS satellites circling the earth. (It will also listen in to the
WAAS satellites in orbit, but more about that in the upcoming segment
introducing you to GPS and WAAS.)
Your unit listens to signals from as many satellites as it can "see" above
the horizon, eliminates the weakest signals, then computes its location
in relation to those satellites. Once it figures its latitude and longitude,
the unit plots that position on the moving map shown on the screen.
The whole process takes place several times a second!
The performance doesn't stop there. Stored in the permanent memory
of every unit is a basic background map of the entire world. We lock it
in here at the factory — you can't change or erase this map.
The background map is suitable for many navigation chores, but for
maximum accuracy and much more detail, you need our optional map-
making software, MapCreate™. Some unit features — such as searching for
businesses and addresses — won't work without a custom MapCreate map.
There is so much detail in our background map (and even more in
MapCreate) that we'll describe their contents and differences in Section 6,
Basic GPS Operations, on page 99.
NOTE:
The LCX-28CHD, LCX-38 CHD and LCX-113CHD have NauticPath™
charts, Fishing Hot Spots
®
Elite charts and all high detail custom maps
preloaded onto a 30-Gigabyte hard drive. Therefore, if you own either the
LCX-28CHD or the LCX-113CHD, you do not need to load any of those
charts/maps into the unit. The unit can also use Navionics
®
charts, but they
must be loaded into the unit via a Navionics card. MMC and SD cards still
will be necessary to log sonar chart data and to store GPS data files.
