MISS YOUR TARGET ON PURPOSE
The Navigation Technique That Can Make You More Accurate
Eric Kelley · EMNAV Field Notes · October 6, 2026 · Land Navigation
Sometimes the best way to find a target is to deliberately miss it.
That sounds wrong.
If your objective is a bridge, trail junction, stream crossing, cabin, or other point on a long linear feature, the obvious solution is to take the most accurate bearing possible and navigate directly toward it.
But there is a problem.
Even a good navigator accumulates error.
Compass error, imperfect bearing maintenance, terrain, pace error, detours around obstacles, and small mistakes in plotting can move the navigator to one side of the intended course.
If you aim directly at a small target and miss it, you may eventually reach the road, stream, trail, or other linear feature on which the target lies.
Now you have another problem.
Which way do you turn?
The target could be to your left.
It could be to your right.
You have reached the correct linear feature, but you still do not know where the objective is.
An experienced navigator can eliminate that uncertainty before taking the first step.
Instead of trying to hit the target directly, deliberately miss it to a known side.
This technique is commonly called deliberate offset.
It turns an unknown error into a planned correction.
Deliberate Offset
Assume your objective is located on a road running generally north and south.
Your calculated route would normally take you directly to the objective.
If you follow that bearing and arrive 100 meters north of the target because of accumulated navigation error, you may not know that you are north of it. You reach the road, look in both directions, and have no reliable reason to choose one direction over the other.
Instead, deliberately alter your approach so you intend to reach the road south of the objective.
Now when you reach the road, the uncertainty is gone.
You know the target is north.
Turn north and follow the road.
The technique does not eliminate navigation error.
It controls the consequences of navigation error.
That distinction is important.
A Simple Example
Suppose your intended course is:
090°
Your objective is:
1,000 meters away.
Instead of traveling directly toward it, you deliberately offset 5° to the right.
Your new azimuth becomes:
095°
If you travel approximately 1,000 meters on that bearing, your lateral displacement from the original line will be approximately:
1,000 × sin(5°) ≈ 87 meters
You have intentionally missed the original line by roughly 87 meters.
That sounds like worse navigation.
It isn't.
You know why you missed.
You know which side you missed on.
Most importantly, you know which direction the original objective lies.
You have replaced uncertainty with geometry.
Right Add, Left Subtract
For a conventional azimuth, increasing the azimuth moves the intended course clockwise, or to the right.
Decreasing the azimuth moves it counterclockwise, or to the left.
So in this example:
Original azimuth:
090°
Offset right 5°:
090° + 5° = 095°
If you deliberately offset right, the recovery is back toward the left.
If you deliberately offset left, the recovery is back toward the right.
The principle is simple.
The navigator decides which side of the target to miss before beginning the movement.
Why 5° Becomes Significant
Five degrees does not look like much on a compass.
Over distance, it becomes substantial.
At 1,000 meters:
1,000 × sin(5°) ≈ 87 meters
At 3,000 meters:
3,000 × sin(5°) ≈ 261 meters
At 5,000 meters:
5,000 × sin(5°) ≈ 436 meters
The angle never changed.
The consequences of that angle did.
This is one of the fundamental lessons of advanced land navigation.
Small angular differences become large positional differences when they are allowed to operate over distance.
The Traditional Solution
When using a deliberate offset toward a target located on a linear feature, the normal field solution is straightforward.
Deliberately arrive on one known side of the objective.
Reach the linear feature.
Turn in the known direction.
Follow the feature to the objective.
The road, stream, trail, ridgeline, shoreline, fence, or other suitable feature effectively becomes a handrail for the final portion of the movement.
This is established navigation practice.
But it raises an interesting question.
What happens when there is no convenient linear feature to follow?
What If There Is No Road or Stream?
Consider a different problem.
Your intended destination is a point in open terrain.
Your original course is:
090°
Distance:
1,000 meters.
You deliberately offset 5° right and travel:
095°
After 1,000 meters, you know that you are approximately 87 meters from the original line.
If you want to recover toward the original intended endpoint, what should you do?
The obvious field answer might be:
Turn 90° left and move approximately 87 meters.
That gets surprisingly close.
But it is not the exact geometric solution.
The Geometric Recovery
The exact geometry contains a subtle detail.
After traveling the offset leg, the target is not exactly 90° to the left of your current heading.
For this particular equal distance geometry, with a 5° deliberate offset, the exact turn is approximately:
92.5° left.
That means:
Current heading:
095°
Exact recovery heading:
approximately 002.5°
Turn:
approximately 92.5° left.
The recovery distance is approximately:
87.2 meters.
This is the geometrically calculated solution.
But now we get to the more interesting field question.
Do you actually need the extra 2.5°?
The 90° Field Rule
Suppose instead of calculating 92.5°, you simply turn:
90° left.
From a heading of 095°, that puts you on approximately:
005°.
Travel roughly the required recovery distance.
You will not arrive at the mathematically exact point.
But you will get remarkably close.
At a 1,000 meter initial leg with a 5° offset, the difference is only a few meters.
At approximately 3,000 meters, the error grows proportionally into the low tens of meters.
At approximately 5,000 meters, it is still only on the order of about 20 meters.
For many field navigation problems, that may be completely acceptable.
For others, it may not be.
| Initial leg | 5° lateral offset | Exact turn | 90° approximation error |
|---|---|---|---|
| 1,000 m | 87 m | 92.5° | about 4 m |
| 3,000 m | 261 m | 92.5° | about 11 m |
| 5,000 m | 436 m | 92.5° | about 19 m |
Field Rule vs. Calculated Solution
A 90° recovery turn is attractive because it is fast, simple, and easy to remember.
It is not the geometrically exact solution.
With a 5° deliberate offset in the geometry described above, the calculated recovery turn is approximately 92.5°.
The important lesson is not that one method is right and the other is wrong.
The lesson is knowing when the difference matters.
If you are trying to recover to a large terrain feature, a road, a broad attack point, or an area where a few meters of error are operationally insignificant, the 90° approximation may be more than adequate.
If the target is small, the distance is long, the terrain provides few clues, or the required precision is greater, the calculated solution becomes more valuable.
Advanced navigation is not always about using the most complicated solution.
It is about understanding the geometry well enough to know when a simpler solution is sufficient.
Precision When You Need It
The EMNAV NAVIGATOR includes a turn angle capability for precisely this reason.
The purpose of a calculated turn angle is not to suggest that every navigator must calculate fractional recovery angles for every movement.
It gives the navigator the option.
For a quick field correction, the navigator may decide that a 90° turn is adequate.
When greater precision is required, the actual geometry can be solved and the more precise turn can be used.
The tool does not replace field judgment.
It gives field judgment better information.
Why the Exact Turn Is Half the Offset Beyond 90°
There is a useful geometric relationship hidden in this problem.
When the original route and the deliberately offset route are equal in length, the two legs form an isosceles triangle with the intended endpoint.
For an offset angle θ, the recovery turn from the offset heading is:
90° + θ ÷ 2
For a 5° offset:
90° + 5° ÷ 2
= 92.5°
For a 10° offset:
90° + 10° ÷ 2
= 95°
For a 3° offset:
90° + 3° ÷ 2
= 91.5°
This relationship applies to the specific geometry being discussed here, where the original intended distance and the deliberately offset first leg are equal.
It should not be treated as a universal turn formula for every deliberate offset problem.
That limitation matters.
Deliberate Offset Is Really Error Management
Deliberate offset is often taught as a navigation trick.
It is better understood as an error management technique.
Every navigation method has uncertainty.
The compass has uncertainty.
Distance estimation has uncertainty.
Pace count has uncertainty.
The map has limits.
Terrain interpretation has uncertainty.
Even a well trained navigator introduces small errors while moving.
Trying to eliminate every source of error is impossible.
Deliberate offset takes a different approach.
It deliberately introduces a controlled error that is larger and more predictable than the uncontrolled error you are trying to manage.
That is why intentionally missing can make the final result more reliable.
You are not navigating badly on purpose.
You are controlling where the error goes.
When Not to Use It
Deliberate offset is not automatically the best technique for every navigation problem.
The technique is most useful when the navigator has a reliable way to recognize the collecting or linear feature, or when the deliberate offset geometry itself provides a useful recovery strategy.
A large deliberate offset can also create unnecessary movement.
The greater the offset angle, the farther you intentionally move away from the direct route.
Terrain may make one side of the target undesirable.
The linear feature may be difficult to recognize.
The final handrail movement may be slower than a direct approach.
The navigator must choose the technique because it solves a specific problem, not simply because the technique exists.
The Bigger Lesson
There is a tendency to think of accuracy as always pointing directly at the target.
Navigation is more complicated than that.
Sometimes the most reliable route to a point is not the shortest route.
Sometimes deliberately introducing error reduces uncertainty.
Sometimes an approximate 90° field correction is sufficient.
Sometimes 92.5° matters.
The navigator who understands only the rule has one option.
The navigator who understands the geometry has choices.
That is the difference between following a procedure and understanding navigation.
Sources & Further Reading
U.S. Marine Corps training material, Land Navigation, Aiming Off. The technique is described as deliberately aiming to one side of a destination located on a linear feature so that, after reaching the feature, the navigator knows which direction to turn toward the objective.
Deliberate offset is established navigation practice. The 90° recovery discussion, the equal length relationship of 90° plus half the offset angle, and the comparison table are EMNAV geometric analysis. They are not presented as military doctrine. EMNAV has not field validated this comparison.
EMNAV FIELD NOTES
Read the sky. Rule the ground.