6. CHART OVERVIEW
6-10
6.1.7 Overlay/NAV Tools box
6.1.8 Alert box
6.1.9 Permanent warning box
6.1.10 EBL, VRM boxes
The EBL measures the bearing to an object, and the VRM measures the range to an
object. See section 6.10.
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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