In what format should the depth for soundings below the datum be indicated?

The depth for soundings below the datum should be indicated in feet and tenths. This level of precision is essential in surveying as it allows for accurate measurements and clear communication of depth information. Feet and tenths provide sufficient detail for various applications, ensuring that surveyors can interpret the data accurately for planning, navigation, and construction purposes.

Using a numerical format like feet and tenths promotes consistency and prevents ambiguity that might arise from using qualitative descriptions or symbols. It also aligns with the common practices in the surveying industry, making the results more universally understood among professionals. Thus, indicating depths in this precise numerical format is crucial for effective surveying and mapping.