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6
longitude, it plots that position on the map shown on the screen. While
the screen is updated once a second the internal calculations are done
several times a second.
The performance doesn't stop there. Stored in the permanent memory
of each AirMap is a basic background map of the entire world. (For just
what's in the map, see the preceding segment on specifications.) We
lock it in here at the factory — you can't change or erase this map.
The background map, along with the Jeppesen and Lowrance aeronautical
databases, are all you need for aerial navigation. (Your unit reads these da-
tabases automatically from the MMC card included in the package.)
The background map is also suitable for many land and marine naviga-
tion chores, but for maximum surface accuracy and much more detail,
you need a custom map from MapCreate 6. Some AirMap 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 compare their contents
and differences in Section 3, Aviation Mode Operation.
Another portion of AirMap's onboard memory is devoted to recording GPS
navigation information, which includes waypoints, event marker icons,
trails and routes. This lets you plan a route for a flight or look back the
way you came. Think of this data storage like the hard drive memory in a
computer. You can save several different GPS data files, erase 'em and
record new ones, over and over and over again. Like any computer file,
these GPS Data Files (file format *.usr) can be shared between AirMaps,
other Lowrance GPS or sonar/GPS units, even personal computers.
AirMap has one more thing in common with a personal computer. Just
as computers have a floppy disk drive for storing and exchanging files,
AirMap has a slot for an MMC (MultiMedia Card) or SD card (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 1 GB in size. (Compare that to a floppy disk's 1.44 MB capacity!)
AirMap uses all that MMC space for two key 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 video
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 handy.) 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 AirMap's
memory. (NOTE: No matter where they come from, GPS Data Files