What is the primary material requirement for a monument set in a practical location?

The primary material requirement for a monument set in a practical location is that it must be constructed of material capable of being detected with ferrous or magnetic locators. This requirement ensures that the monument can be reliably located in the future, particularly when carrying out land surveys or boundary determinations. Utilizing materials that are detectable with magnetic locators allows surveyors and other professionals to find and verify the location of the monument, even years after it has been set.

In a practical context, having a monument made from detectable materials significantly aids in maintaining the integrity of land surveys, as it prevents the loss of crucial reference points that can lead to boundary disputes or challenges in property claims. This focus on detectability aligns with the standards required in land surveying to ensure accuracy and efficiency in locating and identifying boundaries.

Other options may involve practical considerations but do not specifically ensure the monument's detectability as a primary function. For example, while visibility from a distance can be helpful, it does not guarantee that the monument can be easily found using surveying equipment. Likewise, the suggestion that the monument must be made of natural stone or incorporate a GPS chip may represent preferences or advancements in technology, but they do not fulfill the core requirement of being detectable using established surveying tools.