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4. HOW TO CONTROL CHART OBJECTS

4-2

MULTI-COLOR presentation

In the multi-color presentation four colors are used for depths. If the value entered as

the safety contour does not exist in the electronic chart, the system automatically se-

lects the next available deeper depth contour as the safety contour. For example, the

input value is 8 m, but there is no 8 m depth contour in the electronic chart. Then, the

system automatically selects the next available deeper depth contour (10 m) as the

safety contour. The depth contour value of 10 m is used as the safety contour in the

electronic chart.

The shallow contour shows visual color change inside an unsafe water area. An un-

safe water area is all areas shallower than the "safety contour". Set the value for the

shallow contour less than the value of the safety contour.

TWO-COLOR presentation

In the two-color presentation, unsafe water is shown in blue and safe water is shown

in white. The safety contour is used to qualify unsafe water (depth shallower than safe-

ty contour) and safe water (depths deeper than safety contour).

If the value entered as the safety contour does not exist in the electronic chart, the sys-

tem automatically selects the next deeper available depth contour as the safety con-

tour, the same as with the multi-color presentation.

Chart zero

Shallow contour

Safety contour (input value)

Safety contour (exisiting in ENC)

Deep contour

Non-navigable area

Navigable area