🧭 Navigation & Maps

1. Topographic Maps

Reading Contour Lines

Contour lines connect points of equal elevation. Understanding them lets you "see" the three-dimensional landscape from a flat map.

Map Symbols

Map Scale

• 1:24,000 (USGS 7.5-minute) — Most detailed standard topographic. 1 inch = 2,000 feet. Best for backcountry navigation. Print these for your area before a crisis.
• 1:50,000 — NATO military standard. Good balance of detail and coverage.
• 1:100,000 — Regional planning. Less detail, larger area. Good for route planning over longer distances.
• 1:250,000 — Broad area overview. Few topographic details visible.

UTM Grid System

UTM (Universal Transverse Mercator) divides the Earth into 60 zones. Each zone is a 6°-wide strip. Coordinates are given in meters east (Easting) and north (Northing) within the zone. This is the standard used by military, search-and-rescue, and GPS devices.

Reading a grid: Right then Up ("Read Right, Up"). Easting increases left-to-right; Northing increases bottom-to-top.

2. Compass Use & Triangulation

Parts of a Baseplate Compass

Magnetic Declination

Magnetic north (where your compass points) and true north (geographic north pole) are different. The difference is called declination and varies by location and changes over time.

East declination: Add to magnetic bearing to get true bearing. West declination: Subtract from magnetic bearing to get true bearing. Memory: "East is least (subtract), West is best (add)" — from true to magnetic bearing.

Taking a Field Bearing

1. Hold compass level (needle must swing freely) at waist height, in front of you.
2. Point the direction-of-travel arrow at your target (a landmark or destination).
3. Rotate the housing until the orienting lines are parallel to the magnetic needle, with the orienting arrow under the north (red) end of the needle. "Put red in the shed."
4. Read the bearing where the direction-of-travel arrow meets the degree scale on the housing.
5. Adjust for declination as needed.

Following a Bearing

1. Set your desired bearing on the compass housing.
2. Hold level and rotate your body until red is in the shed (north needle aligned with orienting arrow).
3. Look up along the direction-of-travel arrow. Identify a landmark (tree, rock, hill) in that direction.
4. Walk to that landmark without looking at the compass. When you arrive, take another bearing and identify the next landmark.
5. Check every 100–200 meters, not every step. Frequent corrections while walking cause drift.

Triangulation (Finding Your Position)

1. Identify two or three landmarks visible on your map AND visible from where you stand.
2. Take a magnetic bearing to each landmark from your position. Correct for declination.
3. On your map, from each landmark, draw a line in the direction of 180° + your bearing (the back-bearing — pointing back at you). Each line represents "I am somewhere along this line."
4. Where the lines intersect is your position. With two landmarks, you get a line of intersection. With three, a small triangle — you are somewhere inside it.

3. Celestial Navigation

Finding North via Polaris (Northern Hemisphere)

Polaris (the North Star) sits almost exactly at the celestial north pole — it doesn't appear to move as the Earth rotates. Finding it gives you true north within 1°.

1. Find the Big Dipper (Ursa Major) — the distinctive "ladle" or "saucepan" of 7 stars.
2. Identify the two stars forming the outer edge of the "bowl" (away from the handle). These are the pointer stars (Dubhe and Merak).
3. Draw an imaginary line from Merak through Dubhe and extend it approximately 5× the distance between those two stars.
4. The moderately bright star at that point is Polaris. It's at the end of the Little Dipper's handle.
5. Polaris indicates true north. Stand facing it — south is behind you, east to your left, west to your right.

Sun Navigation

The sun rises in the east and sets in the west — roughly. At equinox, this is exact. At other times, the sun rises and sets offset toward north or south depending on the season. Regardless, at solar noon (when the sun reaches its highest point in the sky), it is due south in the Northern Hemisphere (due north in Southern Hemisphere).

Shadow Stick Method

1. Push a straight stick (1m tall) vertically into flat ground in an open sunny area.
2. Mark the tip of the shadow with a stone or stake. Wait 15–20 minutes.
3. Mark the tip of the shadow again.
4. Draw a line between the two marks. This line runs roughly east-west (first mark = west, second mark = east in Northern Hemisphere).
5. Draw a perpendicular line — this is north-south. Confirm: point your left toe at first mark, right toe at second mark — you are now facing north.

Watch Method

• Analog watch: Point the hour hand at the sun. Bisect the angle between the hour hand and 12 o'clock. That line points south (Northern Hemisphere). In Southern Hemisphere: point 12 at the sun; bisect between 12 and hour hand to get north.
• Accuracy: best around equinoxes, poorest near solstices and at higher latitudes. Good to within 15° in most conditions.

Estimating Time to Sunset

Hold your hand at arm's length, fingers horizontal between the sun and the horizon. Each finger width = approximately 15 minutes. Four fingers = one hour until sunset.

Star Charts

4. Natural Navigation

The land itself contains directional information — encoded in vegetation, wind, water, and terrain. These clues are indicators, not certainties. Always use multiple clues together and verify against other methods when possible.

Vegetation Clues

Water Navigation

• Water flows downhill — always. Follow water downhill to reach lower elevations, civilization, or the sea.
• Streams join rivers. Rivers lead to the sea or to inhabited valleys.
• Water collects on the outside of bends — the deepest channel is on the outside of meanders.
• In the wilderness, following water downstream will usually lead to trails, roads, or settlements within 1–3 days of travel in temperate regions.

Wind Patterns

• Sea breeze: During the day, onshore winds (from sea toward land) — useful for coastal orientation.
• Valley winds: In mountains, air flows uphill in the morning (anabatic) and downhill at night (katabatic). This is reliable and can help orient you to valley direction.
• Prevailing winds (North America): Generally west to east at mid-latitudes. Check tree lean and grass bend — they typically orient into prevailing wind.

5. Creating Your Own Maps

Dead Reckoning

Track your position by recording: starting point + compass bearing + distance traveled. A simple but effective way to create a rough map of unknown territory.

1. Establish a reference point (your base camp, a notable landmark).
2. As you travel, record: compass bearing you traveled, and distance (estimated by pace count or time × average speed).
3. Pace calibration: walk 100m on flat ground while counting every time your RIGHT foot hits the ground. This is your "100m count." Most people: 60–70 double paces per 100m.
4. Plot each leg on graph paper: bearing + distance from last point. Build up a map of the area you've explored.

Sketch Mapping

A rough but useful local area map can be created in a few hours by a small team.

• Start with known landmarks (roads, rivers, buildings) and map their relationships.
• Use pacing to estimate distances. Check bearings between landmarks with a compass.
• Use a consistent scale (e.g., 1 inch = 500 feet).
• Add symbols for: water sources (blue), shelters (square), dangerous areas (X), food sources (leaf symbol), trail connections (dashed line).
• Make multiple copies — give one to every patrol or team that leaves base.

Mapping from a High Point

A panoramic sketch from a hilltop is one of the most efficient ways to understand local terrain.

1. From the high point, draw a series of triangles radiating from your position like a fan.
2. Use compass to record the bearing to each significant landmark (hilltop, stream junction, road, building). Note the approximate distance.
3. Back on graph paper, plot each landmark at its bearing and estimated distance from your observed point.
4. Connect with sketched terrain features — ridge lines, valley floors, river courses.

6. Urban Navigation

Urban navigation presents unique challenges: tall buildings block stars and distort compass readings (magnetic interference), terrain features are replaced by streets and structures, and the landscape can change rapidly in post-disaster scenarios.

Orienting in an Urban Environment

• Street grid orientation: Most American cities are laid out on north-south/east-west grids. Street numbers increase in a consistent direction. Study your city's grid pattern before a crisis.
• Landmarks: Water towers, church steeples, broadcast towers, and distinctive buildings serve as reference points. Note their compass bearings from multiple locations while you can still verify with GPS.
• Sun: Even in cities, the sun's position remains reliable. Note which side of buildings is in shade and sun at different times of day.
• Compass reliability: Reinforced concrete and large metal structures deflect compass needles. Step away from buildings by 5–10m before taking bearings.

Moving Safely Through Urban Areas

• Avoid open ground when uncertain of threat level. Move along the edges of streets, using cover.
• Travel in pairs minimum — one navigates, one observes.
• Pre-plan multiple routes between important locations. Know primary, secondary, and tertiary routes.
• Mark known safe routes with subtle signals (chalk arrows, flagging tape) for your group.
• Avoid bridges and tunnels — these are chokepoints and easily controlled or trapped.
• Know the locations: hospitals, water treatment plants, food distribution points, police/fire stations, community gathering points.

7. Compass Rose & Star Charts

Compass Rose

Northern Hemisphere Star Chart — Key Constellations

Key Stars for Navigation