6. Routes known to be used by the enemy.
7. Routes of patrols.
8. Points where ammunition or supplies are believed to be dumped.
9. Ranges to prominent or important points. This information will be less likely to mislead if the following rules are observed:
Carefully indicate the point from which each range is taken.
Use prominent, easily identified landmarks as reference points.
Indicate by whom and how ranges were determined.
10. Report any repairs needed in trenches or obstacles.
11. Position of suspected mines.
6. Equipment.—Telescopes, rather low power, are preferable to field glasses for observation and reconnaissance. Care must be taken to render them as inconspicuous as possible and prevent their location by the enemy through reflection of light from the object glass.