JRC JMR-7230-S Instruction Manual page 557

(2) Example of displaying Four Shades
Shallow Contour
Safety Contour
Safety Depth
Deep Contour
When [Four Shades] is enabled (the sea area is displayed by four colors.)
When [Four Shades] is disabled (the sea area is displayed by two colors.)
Land
16-35 Section 16 Setting up Screen View
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付録