Zooming In/Out (S-57/C-Map Only) - JRC JAN-701B Instruction Manual

3.5.2 Zooming In/Out (S-57/C-MAP Only)

You can zoom in or out using the [RANGE +/-] key, [Zoom In]/[Zoom Out] button, or [Scale]/[Range]
drop-down list button.
(1) Zooming in/out using the operation panel
1) On the operation panel
Press the [RANGE +] or [RANGE -] key.
Each time the key is pressed, the chart is zoomed in or out by the amount or
the scale set by the system.
- Select range or scale for the zooming method.
- For switchable ranges, see 3.5.3 "Switching the Range (S-57/C-MAP Only)." For scales, see
3.5.4 "Switching the Scale (S-57/C-MAP Only)."
(2) Zooming in/out using the display panel
1) On the display panel
Left-click the [Zoom In] or [Zoom Out] .
Each time you press the key, the chart is zoomed in or out by the amount
set by the system.
Over-scale alarm:
When the ship enters a different chart, an over-scale occurs
if the displayed chart is more than double in size than the
original data. The vertical lines as seen in the figure on the
right will be displayed on the "chart" and will appear to notify
lower chart accuracy and clarity.
The vertical lines will not display if the size has been made
larger (double or more) through proper operation.
Warning lines for overscaling
3-61 3 Basic Operation of ECDIS
ECDIS