Soundings above the datum are shown in what way compared to those below the datum?

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Multiple Choice

Soundings above the datum are shown in what way compared to those below the datum?

The concept here is using a clear visual cue to separate measurements relative to a reference level. A datum provides that reference plane, so elevations or depths that sit above or below it must be easy to tell apart at a glance. The standard approach is to display soundings above the datum in a different color or with a different line designation than those below. This makes reading the chart unambiguous—readers can quickly distinguish features that are above the reference level from those that are below it. The exact colors or line styles can vary by standard, but the core idea is to use an alternate color or line designator to prevent confusion and improve clarity.

The concept here is using a clear visual cue to separate measurements relative to a reference level. A datum provides that reference plane, so elevations or depths that sit above or below it must be easy to tell apart at a glance. The standard approach is to display soundings above the datum in a different color or with a different line designation than those below. This makes reading the chart unambiguous—readers can quickly distinguish features that are above the reference level from those that are below it. The exact colors or line styles can vary by standard, but the core idea is to use an alternate color or line designator to prevent confusion and improve clarity.

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