Brunton Atlas MNS Spezifikationen PDF herunterladen (Seite 12)

How Atlas Works

You'll navigate faster and easier if you understand how Atlas 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 new-found knowledge.)

First, think of your Atlas as a small but powerful computer. (But don't worry

— we made Atlas easy to use, so you don't need to be a computer expert

to find your way!) The Atlas includes a keypad and a screen with menus so

you can tell it what to do. The screen also lets Atlas show your location on

a moving map, as well as point the way to your destination.

This pocket-sized computer also contains an antenna and specialized

scanning receiver, something like your car radio. But instead of your favor-

ite 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.)

Atlas listens to signals from as many satellites as it can "see" above the hori-

zon, eliminates the weakest signals, then computes its location in relation to

those satellites. Once Atlas figures its latitude and longitude, it plots that posi-

tion on the moving map shown on the screen. While the screen is updated

once a second, your Atlas is making these internal calculations and determin-

ing its position several times a second!

The performance doesn't stop there. Stored in the permanent memory of

each Atlas 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.

Another portion of Atlas's onboard memory is devoted to recording GPS

navigation information, which includes waypoints, event marker icons,

trails and routes. This lets you look back the way you came. Think of this

data storage like the hard drive memory in a computer or a tape in a cas-

sette tape recorder. You can save several different GPS data files, erase

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

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

Atlas units, other Brunton GPS or sonar/GPS units, even personal com-

puters.

Atlas has one more thing in common with a personal computer. Just as

computers have a floppy disk drive for storing and exchanging files, Atlas

has a slot for an MMC (MultiMedia Card) or SD (Secure Digital) Card flash

memory card. These solid-state memory devices are about the size of a

postage stamp, but can hold data ranging from 8 MB to 512 MB in size.

(Compare that to a floppy disk's 1.44 MB capacity!) Atlas uses all that

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