Lowrance electronic globalmap baja 840c 用户手册

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tape in a cassette tape recorder. You can save several different GPS data 

files, erase 'em and record new ones, over and over again. Like any com-

puter file, these GPS Data Files (file format *.usr) can be shared be-

tween Lowrance GPS or sonar/GPS units or even personal computers. 
This GlobalMap Baja has one more thing in common with a personal 

computer. Just as computers have a floppy disk drive for storing and ex-

changing files, the unit has a slot for an MMC (MultiMedia Card) or SD 

(Secure Digital) card flash memory card. These solid-state memory de-

vices are about the size of a postage stamp, but can hold data ranging 

from 8 MB to 1 GB in size (Compare that to a floppy disk's 1.44 MB ca-

pacity!). This unit uses all that MMC space for two key GPS purposes. 
First, you can backup your onboard GPS Data Files by copying them to 

the MMC. Since the MMC is removable (like a floppy disk or a cassette 

tape), you can store these GPS Data Files on a personal computer 

equipped with an MMC card reader (Or store them on a pocketful of 

MMCs, if you don't have a computer.). Our MapCreate mapping software 

can save, edit or create its own GPS Data Files, which can be copied to the 
MMC and then loaded from the MMC into the unit's memory (NOTE: No 
matter where they come from, GPS Data Files must be loaded from the 

MMC into memory before the GlobalMap Baja can use them.). 
The other key GPS use for MMCs is storage of special high-detail, cus-

tom maps, which you can produce on your computer with our MapCre-

ate software. These MapCreate custom maps contain more detail than 

the basic background map. These Custom Map Files (file format 

*.lcm) can also be shared between Lowrance GPS or sonar/GPS units 

and personal computers. 
This unit automatically reads Custom Map Files directly from the 

MMC or SD card. To use a custom map, all you need to do is slide an 

MMC containing a map into the GlobalMap Baja 840c. 

Well, now you know the basics of how the unit does its work. You might 
be ready to jump ahead to Section 2, Installation & Accessories, on page 

9, so you can mount your GlobalMap Baja and plug in the power. Or 

you might want to see how our text formatting makes the manual tuto-

rials easy to skim. If that's the case, move on to "How to Use This Man-

ual" on page 6. But, if you want to understand the current state of sat-

ellite navigation, look over this segment describing how GPS and its 

new companion WAAS work together to get you where you're going. 
The Global Positioning System (GPS) was launched July 17, 1995 by 

the United States Department of Defense. It was designed as a 24-

hour-a-day, 365-days-a-year, all weather global navigation system for