What supplementary information improves accuracy when describing a location with the hundred-block system in low-visibility conditions?

• A. Nearby landmarks, cross streets, and visual confirmation from the caller or units on scene.
• B. The time of day.
• C. The color of nearby buildings.
• D. The radio channel used.

Answer: (A)

In low-visibility situations, describing a location using the hundred-block system becomes reliable when you add tangible reference points that others can quickly verify. Nearby landmarks give a distinct, easy-to-spot cue that people can recognize even when you can’t see far ahead. Including cross streets provides precise grid anchors so responders know exactly where between two streets the incident is occurring. Getting visual or verbal confirmation from the caller or units on scene ties the description to what’s actually visible and verified at the location, reducing the chance of miscommunication.

Time of day, the color of nearby buildings, or the radio channel used don’t directly improve pinpointing a place. Time and color can change or be ambiguous under poor lighting, and the radio channel doesn’t convey location information.