Lowrance 100 Installation And Operation Instructions Manual page 23

With "AIRSPACE STATUS" highlighted, press the right arrow key. The center
screen above shows next. In this example, we're in Tulsa class "C" airspace.
The time and distance remaining until we leave the inner ring of the airspace
(assuming we keep the present track and speed) shows on this screen
above the ceiling and floor of the airspace. Since we're near the center of
the class "C" airspace, (see the map at the bottom of the previous page)
page one shows information about the inner ring, page two shows outer
ring information. To view page two, simply press a right or left arrow key.
Press the EXIT key to erase the status screens.
Airspace Information
You can identify an airspace without physically entering it by using the
cursor. To do this, press any arrow key while a map is showing. In this
example, we're using Map 1. The cursor appears. Now move the cursor to
the desired airspace as shown below left. (Note: You may have to zoom-in
and/or zoom-out to view the airspace.)
With the cursor moved to the airspace, press the MENU key. A screen
similar to the one in the center appears.
Now highlight the "AIRSPACE INFO" label and press the right arrow key.
A message screen appears as shown above right.
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