Lowrance 540c baja 操作ガイド

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The above memory capacities refer only to the GlobalMap's on-board 

memory. The amount of GPS data you can record and save for recall 

later is limited only by the number of MMC cards you have. 

You'll navigate faster and easier if you understand how the GlobalMap 

540c BAJA scans the sky to tell you where you are and where you're 

going. (But if you already have a working understanding of GPS receiv-
ers and the GPS navigation system, skip to Section 2, Installation & 
Accessories on page 11. If you're new to GPS, read on, and you can later 

impress your friends with your new-found knowledge.) 
First, think of your unit as a small but powerful computer. (But don't 

worry — we made it easy to use, so you don't need to be a computer ex-

pert to find your way!) The GlobalMap 540c BAJA 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 GlobalMap 540c uses a LGC-BAJA module, 

which makes the whole system work something like your car radio. But 

instead of your favorite dance tunes, this receiver tunes in to a couple 

of 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 the GlobalMap 540c figures its lati-

tude and longitude, it 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 each 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

™ 6. Some unit features — such as search-

ing for businesses and addresses — won't work without a custom Map-

Create 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 3, Basic GPS Operations, on page 36. 
Another portion of your GlobalMap’s onboard memory is devoted to re-
cording GPS navigation information, which includes waypoints, event