Navigating through the wilderness can be intimidating, but learning to use a map and compass together is a reliable skill that can guide you safely through various environments. It's a traditional technique that, although it may seem old-fashioned in the digital age, has been a trusted method for centuries.
Why Use a Map and Compass?
While GPS devices and smartphones offer convenience, they can fail due to dead batteries, signal loss, or malfunctions. A map and compass, however, do not rely on satellite signals or electricity, making them dependable tools in remote areas and adverse conditions.
Understanding the Basics
Before combining the two tools, it's important to understand their individual functions:
Map: A map is a scaled-down representation of a portion of the Earth's surface. It provides details about terrain features, elevation, distances, and landmarks. Topographical maps, in particular, display contour lines to illustrate elevation changes, helping you visualize the three-dimensional landscape.
Compass: A compass is used to determine direction. The magnetic compass works by aligning itself with the Earth’s magnetic field, pointing towards the magnetic north.
Components of a Compass
Here are the main components you'll need to be familiar with:
Magnetic Needle: The needle that always points toward magnetic north.
Orienting Arrow: Fixed on the base of the housing, this is used to align with the needle.
Compass Housing: The circular, rotating part with degree markings.
Baseplate: A transparent base that helps align with the map.
Direction-of-Travel Arrow: Located on the baseplate, it shows the direction you will travel.
Step-by-Step Guide to Using a Map and Compass Together
1. Understanding the Map
First, familiarize yourself with the map’s legend, scale, and north indication (usually at the top). Recognize important symbols and contour lines that indicate elevation and terrain features.
2. Setting the Map
Hold the map horizontally and use the compass to orient it. Lay the compass on the map and rotate the map until the magnetic needle aligns with the north-south grid lines or the top of the map.
3. Taking a Bearing from the Map
- Identify your starting point and destination on the map.
- Place the compass on the map with the baseplate edge connecting these points.
- Turn the compass housing until the orienting arrow aligns with the map's north.
4. Following the Bearing
- Lift the map, and hold the compass flat.
- Turn your body until the magnetic needle aligns with the orienting arrow.
- The direction-of-travel arrow now points towards your destination. Follow this direction.
5. Adjusting for Declination
Understand that true north and magnetic north differ, usually by a number of degrees called declination. Adjust your compass accordingly for accurate navigation:
- If the declination is east, subtract it from your bearing.
- If west, add it.
For example, if traveling in an area with 10° west declination, and your map bearing is 60°, adjust your compass to 70°.
6. Triangulation for Location Verification
When uncertain of your exact position, triangulation can help:
- Identify two or three landmarks on the map and in the landscape.
- Take bearings to these landmarks.
- Draw lines on the map corresponding to these bearings. Your position is at their intersection.
Practical Example
Imagine you're hiking through forest terrain. You've reached a fork in the path, but your destination is a known peak.
- Use your map to identify the peak and your current location.
- Take a bearing as described. The compass indicates you should veer left at the fork.
- Adjust for declination using the map's information.
- Follow the adjusted bearing until you reach the peak, verifying it with the visible contour lines.
Conclusion
Mastering the art of using a map and compass together enhances your ability to navigate various terrains and conditions. This skill can offer peace of mind and safety, knowing that you possess the knowledge to find your way without relying solely on technology.
References and further reading can deepen your understanding. Books like "Be Expert with Map and Compass" by Björn Kjellström and websites like the USGS offer excellent resources for continued learning.
Remember, practice is key to confidence in navigation. With time and experience, using a map and compass can become second nature, opening up the world to your explorations.