The survey information upon which a chart is based is found _____

The survey information upon which a chart is based is typically found near the chart title because this positioning ensures that it is easily noticeable to users of the chart. The chart title is often the first point of reference for navigators, allowing them to quickly assess the validity and reliability of the information presented. The survey data typically includes the date of the survey, details about the methodology used, and the authority responsible for the chart, making it crucial for mariners to understand the context and accuracy of the navigational data they are using.

Other locations, such as the lower left corner or any convenient location, do not provide the same immediate visibility and prominence, which could lead to crucial survey information being overlooked. The requirement for this information to be prominently displayed emphasizes its importance in ensuring safe navigation.