Lowrance LCX-20C, Operation Instructions Manual

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The arrow in the center of the screen is your present position. It points
in the direction you're traveling. The map zoom range is the distance
across the screen. This number shows in the lower right corner. In the
example below, the range is 15 miles from the left edge of the map to
the right edge of the map.
The Zoom In and Zoom Out keys zoom the map to enlarge or reduce its
coverage area and the amount of mapping detail shown. There are 37
available map zoom ranges, from 0.05 miles to 4,000 miles.
The map is zoomed to 15 miles. The Over Zoomed notice in the top left
corner means you have reached the map’s detail limits for the area.
Zooming in any closer will reveal no more map details because a
custom map has not been loaded on the MMC.
If you're using only the factory-loaded background map, the maximum
zoom range is 20 miles. You can continue to zoom in closer, but the map
will simply be enlarged without revealing more map content (except for
a few major city streets.) Load your own high-detail custom map made
with MapCreate, and you can zoom in to 0.05 miles.
Map Pages with high-detail MapCreate map. Arterial streets appear at
the 6 mile zoom range, with a few Point of Interest icons visible (left).
Numerous Points of Interest dots become visible at the 3 mile range,
along with minor streets (center). At the 0.6 mile zoom, you can see an
interstate highway with an exit, major and minor streets as well as
Point of Interest icons (right).