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30 GPSMAP 188/188C Sounder Owner’s Manual
MAIN PAGES > MAP PAGE
The GPSMAP 188/188C Sounder’s system has a built-in
worldwide database to 20 mi, with more detailed coverage
available through the use of the optional BlueChart or MapSource
data. The GPSMAP 188/188C Sounder displays cartography as
long as there is chart information available for the range you have
selected. Map coverage conforms to the following conditions:
• When the selected zoom range is covered by the internal
database, BlueChart, or MapSource data, cartography 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.
Map Page Options
Many features of the GPSMAP 188/188C Sounder are menu
driven. Each main page has an options menu, allowing you to
customize the corresponding page to your preferences and select
special features that specifically relate to that page. The data
window, located at the top of the main pages, provides a user-
selectable layout of various types of useful data. Each data field can
be configured to display any one of several data options. The data
window layout can be configured to display additional data fields
and change the size of the data displayed.
To display and select the Map Page options:
1. Press MENU.
2. Use the ROCKER to highlight an option, and press ENTER.
The available options are Full Screen Map/Show Data, Change
Numbers, Measure Distance, Show Sonar (If equipped with a
transducer, see the “Using Sonar” section on pages 78-91 for
details on this feature,) Set Up Map and Turn Declutter On/Off.
Following are details on using each of these options.