Quick Answer
Common mistakes when using a sighting compass include tilting the compass, not accounting for declination, and not taking into account the difference between magnetic and true north.
Incorrect Tilt Angles
One of the most common errors when using a sighting compass is taking an inaccurate tilt angle. This is usually due to not allowing for the angle of depression or the terrain’s incline. To avoid this, take a moment to mentally adjust for the angle of the land and ensure the compass is level with the horizon.
Declination Calculation
Declination, or the difference between magnetic and true north, is another critical factor to consider. It varies depending on your location and time of year, with some areas experiencing up to 20 degrees of declination. To accurately calculate declination, use a declination chart or consult with a local expert. In areas with significant declination, adjust your compass reading accordingly.
Sighting Technique
Proper sighting technique is also essential when using a sighting compass. Hold the compass level and steady, with the sighting hole aligned with the object or feature you are trying to locate. Take a moment to focus on the alignment and ensure the compass is not skewed. If using a mirror or second sighting point, adjust for the angle of the mirror or second point to achieve accurate alignment.
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