6. CHART OVERVIEW
6-10
6.1.7 Overlay/NAV Tools box
6.1.8 Alert box
6.1.9 Permanent warning box
The [Overlay/NAV Tools] box sets up
the following objects and consists of
the following pages.
• TT/AIS
• Parallel index lines
• Range rings
• Predictor (predicts ship’s future
movements)
• Under the keel clearance graphic
• Anchor watch
• Check area
See chapter 15 for information about
objects other than TT/AIS.
The [Alert] box shows operational and system
alert messages, with alert ID no. and alert mes-
sage. See chapter 20.
The permanent warning box displays chart-related
warning messages. The box cannot be closed or min-
imized.
Page
selection
buttons
Minimize button
Page name
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