Simrad CA34, Manual

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Chapter 4-4 CA34/44/54 Chart menu and INFO windows
4.1.4 Range or zoom function
With chart display active:
1-9
Press one of the numeric keys to quickly change the chart scale:
[1] = 1:600 [2] = 1:2,000 [3] = 1:6,000
[4] = 1:20,000 [5] = 1:60,000 [6] = 1:200,000
[7] = 1:600,000 [8] = 1:2,000,000 [9] = 1:6,600,000
-
Press the minus key to zoom in for details (smaller range)
+
Press the plus key to zoom out for overview (greater range)
Using the extended level range will give the best result when chang-
ing chart range. First use one of the numeric keys (Quick-Range
1-9) to select the required chart, then ‘fine tune’ the range within
the same chart level by using the +/- keys. Depending on the actual
chart, you can zoom in or out two to three times before the extended
level range is switched off and the chart changes to a new level of
details.
The extended level range can be toggled OFF/ON in General settings
(default = OFF) - see section 4.5 Chart setup.
Chart details may not be available in all scales in all areas. Non-
covered areas will be marked as hatched or all blue/white with
coordinate grid (when Grid is set to AUTO (default) in chart setup),
depending on the actual scale - see section 4.5 Chart setup for more
details in regard to what can be shown on the chart and what you
may choose not to have shown.
The
built-in world chart
can be zoomed up/down in six steps, from
a scale of approx. 1:33,000,000 to 1:2,000,000.
An
over-zoom function
enables you to zoom beyond the chart,
which automatically is switched off and replaced by a lat/long coor-
dinate grid. In this mode, the scale can go down to 1:600.
‘Auto chart select’ must be switched OFF, see section 4.5 Chart
setup.