Why is passive ranging used instead of active ranging?

• A. Because some vehicles can detect the LRF beam
• B. Because passive ranging is faster
• C. Because it requires less training
• D. Because it is not affected by weather

Answer: (A)

Ranging without emitting signals keeps your position hidden. Some vehicles have sensors that can pick up a laser rangefinder beam. If they detect that beam, they know you’re targeting them and can respond with countermeasures or quick evasive actions. Using passive ranging avoids giving away your presence, which is crucial in anti-tank work where staying hidden can determine the outcome of the engagement.

Active ranging, by contrast, would reveal you simply by the act of emitting the laser, even if it might sometimes be fast. Training needs and weather effects aren’t the defining factor here; they don’t explain why passive ranging is preferred in this context.