When abbreviations are necessary in surveying, what must also be included?

Including a thorough legend that describes the abbreviations is essential in surveying because it ensures clarity and understanding of the document. Abbreviations are often used to convey information efficiently, but without a legend, they can lead to confusion about their meanings. A well-prepared legend provides definitions and clarifies the context in which the abbreviations are used, allowing all viewers of the survey, including clients, contractors, and other professionals, to accurately interpret the information presented. This practice promotes precision in communication, which is critical in legal and technical documents associated with surveying.

The other choices, while they may have their own relevance in different contexts, do not address the immediate need for clarity around abbreviations in a survey. Legal signatures, multilingual translations, and the history of the survey can be important for other reasons, but they do not replace the necessity of having a clear legend for abbreviations.