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GPSMAP 176/176C Owner’s Manual 11
BASIC OPERATION > SELECTING MAP ZOOM RANGES
Selecting Map Zoom Ranges
The map display has 28 available zoom ranges from 20 ft. to 800 mi.
(5 m to 1,200 km). The zoom range is controlled by the IN and OUT
keys, with the current range displayed at the bottom right of the data
window. Press the OUT key to zoom out and the IN key to zoom in.
NOTE: The range value represents the distance from one end of
the range bar to the other.
Using BlueChart/MapSource Data
Using Built-In Basemap
Overzoom, no additional data
The GPSMAP 176/176C has a built-in worldwide database. More
detailed coverage is available through optional BlueChart or
MapSource data. The GPSMAP 176/176C displays cartography as
long as chart information is available for the range you select.
Map coverage conforms to the following conditions:
• When the selected zoom range is covered by either the internal
database, BlueChart, or MapSource data, mapping is displayed.
• When the selected zoom range is covered by both the internal
database and BlueChart/MapSource data, cartography is
displayed using the data with the best resolution.
• When the selected zoom range exceeds the resolution of the
data in use, an Overzoom warning appears below the range.