G-charts – Garmin GPSMAP 180 User Manual

Page 78

Using Micro G-chart Cartography

Once a Micro G-chart cartridge has been inserted, the map coverage outlines

for the cartridge will automatically appear on-screen. Keep in mind that the dis-

play 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 C 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 Micro G-chart cartridge is installed, the GPSMAP 180s system will

automatically use the best available chart for display. As you enter and exit various

subcharts, 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 180 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 Micro G-chart offshore car-

tography.

B. Map outlines for Micro G-chart inland cartog-

raphy.

Note: The smaller boxes located within larger

boxes indicate areas of greater detail.

SECTION

G-CHARTS

Using Micro G-chart

Cartography