Using G-chart Cartography
Once a G-chart cartridge has been inserted, the map coverage outlines for the
cartridge will automatically appear on-screen. Keep in mind that the display will
not automatically scroll to the map area or zoom to a level where you can see the
coverage outlines. If you do not immediately see the outlines, scroll the cursor to
the broad geographic area covered by the chart and zoom out to another map
scale.
The large outlined box shown is the main chart, which serves as the boundary
area for the entire cartridge. The small outlined box inside the main box are sub-
charts, which provide more detailed coverage of the area indicated. To view the
detailed cartography of any subchart, scroll the cursor to the subchart outline and
use the
Z
key to zoom in to smaller range scales. If the map outlines still do not
appear, check the ‘Map Outlines’ setting on the map options page to make sure
they are set to appear (see page 26).
Whenever you zoom past the usable range of the current electronic chart, the range
field will display ‘Ovr Zm’ or ‘No Map’. These warnings indicate that although you
may still have cartography, you should exercise extreme caution using the data. See
page 25 for more information on Overzoom and No Map modes.
When a G-chart cartridge is installed, the GPSMAP 130’s system will automati-
cally use the best available chart for display. As you enter and exit various sub-
charts, the system will automatically display the appropriate chart for the area you
are in. When you leave the area covered by the main map of a cartridge, the
GPSMAP 130 will default back to using the built-in 64 nm database if it is avail-
able at the current scale.
If you are not seeing certain map items (navaids, depth contours, etc. on
offshore cartridges; highways, boat ramps, etc. on inland cartridges), check the
map configuration settings available from the map options page.
A.
Map outlines for G-chart offshore cartography.
B.
Map outlines for G-chart inland cartography.
66
A
B
SECTION
10
G-CHARTS
Using G-chart
Cartography
gps 130 7/23/98 9:22 AM Page 66
