What should be included on a Survey Map or Survey Plat when data is based on non-observable sources?

Including a statement of the data's source on a Survey Map or Survey Plat is essential, especially when the data stems from non-observable sources. This practice is crucial because it provides transparency regarding the information's reliability and origin. By citing the source, surveyors enable users of the map to understand the context in which the data was gathered and assess its accuracy. It fosters trust in the survey by allowing others to verify the information or consider its limitations.

When it comes to the remaining options, while noting legal implications and potential inaccuracies can be valuable for certain circumstances, they do not hold the same foundational importance as sourcing data. Presenting only an approximation of underground utilities lacks the precision needed for a formal survey, making it insufficient as well. The focus must be on establishing the credibility of the data presented, which is predominantly achieved through clear sourcing.