A sector on a map is formed by gradicule tick marks, each tick mark measuring how many minutes in size?

A sector on a map is formed by gradicule tick marks, each tick mark measuring how many minutes in size?

• A. 2.5
• B. 1
• C. 5
• D. 10

Answer: (A)

Gradicule marks are the smaller increments used to subdivide angles on a map. In many gradicule scales, the larger steps are set at 5 minutes of arc, and the tick marks between them are half of that distance. So each gradicule tick represents 2.5 arcminutes. This gives a practical balance between readability and precision. The other options describe either the larger step (5 minutes) or even coarser or finer subdivisions that aren’t the standard gradicule ticks between major marks.

Gradicule marks are the smaller increments used to subdivide angles on a map. In many gradicule scales, the larger steps are set at 5 minutes of arc, and the tick marks between them are half of that distance. So each gradicule tick represents 2.5 arcminutes. This gives a practical balance between readability and precision. The other options describe either the larger step (5 minutes) or even coarser or finer subdivisions that aren’t the standard gradicule ticks between major marks.