Environmental anomalies are changes in sound, smell, light or flow that you can only recognise if you know what is normal: a creek that stopped flowing, insects gone quiet, new engine or chopping noise, wood smoke from a new direction, or a light where there was none. Each has more than one possible cause, so note it, find its direction and distance if you can, and watch from cover instead of going to look. Pair every anomaly with your baseline before you decide what it means.
Part of Situational Awareness
An anomaly in sound, smell, light or flow is only recognisable against a known normal. The parent article lists absent sounds, new sounds, new smells and visual changes.
Absences Count as Much as New Things
The parent article lists absent sounds, new sounds, new smells and visual changes. A missing sound is easy to miss because nothing is there to notice.
- Absent sounds — the creek stopped flowing (someone may have dammed it upstream, or it may have dried or frozen); the insects went quiet (something large may be moving nearby).
- New sounds — engine noise, chopping, hammering, gunshots.
- New smells — wood smoke from a new direction, cooking food, diesel fuel, human waste.
- Visual changes — new tracks on a daily trail, a branch broken that was intact yesterday, items moved at a cache site.
- Night lights — new lights such as fires or flashlights stand out against a known baseline.
What You Need
- A baseline of sounds, smells and light — see Establishing Normal Patterns.
- Sound mapping practice — see the drills in the parent article.
- A habit of listing alternatives — more than one cause for each anomaly.
Method: Locate, List, Wait
Step 1: Locate Turn toward the sound or smell. Estimate direction and rough distance.
Step 2: List the causes Write two or three possible causes. A creek that stopped may be a dam, a dry spell or ice; each leads to a different action.
Step 3: Take the safest check Check from a distance: listen again in a few minutes, watch the smoke, look at the water downstream. Do not walk to the source.
Step 4: Check your water A change in flow can change water quality. Treat before drinking; see Water Purification.
Step 5: Record and brief Note the time, direction and what you concluded.
Common Mistakes
- Deciding on one cause — keep the alternatives open until evidence narrows them.
- Going to look — approach carries the greatest risk and gains least.
- Forgetting the smell — smoke, fuel and waste carry far.
What’s Next
- Learn next: Baseline Behavior — what makes an anomaly visible
- Combine with: Night Observation — noticing lights and sounds in the dark