Which of the following best describes a requirement for existing corners in surveying?

In surveying, the requirement for existing corners is that they should have clear physical markers. This is essential because these markers serve as crucial reference points that denote property boundaries, control points, or other significant locations in land surveys. Clear physical markers enable surveyors to accurately identify and verify corners, ensuring precise measurements and compliance with legal descriptions. Physical markers can be monuments, pins, or other durable markers that signify the location, and they provide tangible evidence of the surveyed corner, which is vital for maintaining property rights and resolving any potential disputes.

While some local laws may govern land surveying practices and existing corners, the presence of clear physical markers is a more fundamental requirement that directly influences the survey's accuracy and reliability. Existing corners do not necessarily have to be surveyed within a specific timeframe such as the last five years, nor is there a requirement for new surveyors to re-establish corners if they are clearly marked. Instead, the emphasis is on the clarity and visibility of the markers to uphold the integrity of the surveying process.