📘 Guides › 🥾 Getting around · 🆘 Emergency · 📇 Index A–Z

🧭 Navigation & Weather Without GPS or Forecasts

How to find your way in the hills around the Illinois Valley with a paper map and compass — or with neither — and how to read the weather coming when there is no forecast: map reading, declination, pace count, terrain association, finding yourself when lost, the sun and stars, clouds and wind, our local weather from valley fog to east-wind fire days, lightning, and a home weather log. The books are in Navigation-Weather\Land-Navigation and Navigation-Weather\Weather; the local topo maps are in Maps\Topo-USGS and Maps\Forest-Service (see the Maps section of the Illinois Valley guide).

⚠️ Rules that prevent the worst outcomes

🗺️ Reading a topo map

Scale. The library's local quads (US Topo and FSTopo) are 1:24,000: 1 inch = 2,000 ft (using the bar scale; Topographic map). On the 1:100,000 Forest Service sheet, 1 inch is about 1.6 miles. Map distance is "as the crow flies"; walking a steep slope is farther (USGS FS 035-01, p. 1; PMS 475, p. 133).

Contour lines (FS 035-01, p. 1; PMS 475, pp. 41–42; Contour line; a contour map beside the land it shows; FM 3-25.26, p. 107):

A drawing of hills, a cliff and a bay seen from the side, and below it the same land drawn as a contour map The same land as a picture (top) and as contour lines (bottom): the lines almost touch at the cliffs and spread far apart on level ground (PMS 475, p. 40).

Name the land. Learn to spot these on the map and on the ground — it is the heart of navigating without GPS (FM 3-25.26, pp. 115–118):

Feature On the map On the ground
Hill (drawing) Closed rings Ground falls away on all sides
Saddle (drawing) Hourglass between two hills Low dip between two high points
Valley (drawing) V or U contours with a stream Low ground between ridges
Ridge (drawing) Long line of high ground Ground falls away on three sides
Depression (drawing) Ring with tick marks inside A hollow
Draw (drawing) Small V pointing uphill Small gully
Spur (drawing) Small U pointing downhill Finger of high ground off a ridge
Cliff (drawing) Contours touching or merged Near-vertical drop

Symbols: US Topo Map Symbols (2023) matches the library's GeoPDF maps; the older USGS symbol booklet matches older quads and FSTopo.

Grid position. The valley is in UTM Zone 10 ("10T" on the quads). Grid lines are every 1,000 m. Read right first (easting), then up (northing) (USGS FS 077-01, pp. 1–2; grid lines; reading a UTM coordinate; UTM).

📚 Go deeper: FM 3-25.26 — the Army's full map-reading course; PMS 475 — firefighter workbook with exercises; FSTopo Cave Junction — practice on your home sheet.

🧭 Compass and declination

Use 14° East for the Illinois Valley. NOAA's model gives 13.9° E for Cave Junction in November 2026, shrinking about 0.1° a year. The FSTopo Cave Junction sheet prints 14°8′ (2024) and the US Topo sheet 14°18′ (2023). Older maps print larger numbers — use the newest value. See Magnetic declination.

Which way to correct (FS 035-01, p. 2; PMS 475, p. 86):

Diagram: true north points straight up and magnetic north 14 degrees to its right; map to compass subtract 14, compass to map add 14 Here the compass needle points 14° east of true north: subtract 14° going from map to compass, add 14° going back (a diagram drawn for this guide).

Why it matters: 1° of error puts you about 920 ft off in 10 miles (PMS 475, p. 86). Ignoring all 14° puts you about 1,300 ft off for every mile (general practice: worked out from the angle).

Grid north on the Cave Junction quad is only about half a degree from true north — ignore it on foot. That's why the margin shows three norths (FM 3-25.26, p. 62; three norths).

The way back (back azimuth): add 180° if the bearing is 180° or less; subtract 180° if more. A slip here can be disastrous — check it twice (FM 3-25.26, p. 58; direct and back bearing).

Compass habits (PMS 475, p. 84; FM 3-25.26, p. 97; parts of a compass):

📚 Go deeper: USGS Finding Your Way — taking a bearing off a topo map; PMS 475, pp. 82–86 — parts of a compass and setting declination.

👣 Pace count: measuring distance on foot

(FM 3-25.26, pp. 52–53; PMS 475, pp. 133–134)

  1. Measure a 100 m (328 ft) course on ground like where you'll travel — a road shoulder with a tape or a measured fence line works (rule of thumb).
  2. Walk it naturally and count your steps. The Army's example is about 120 steps per 100 m. Walk it several times and average.
  3. Expect more steps (why the ground is longer than the map) uphill, into a headwind, in mud, sand, snow or brush, in rain, and in fog or darkness.
  4. Keep a separate, shorter night count (p. 141).
  5. Don't try to remember the count. Move a pebble from one pocket to the other, or tie a knot, every 100 m (pace count beads).

⚠️ The Forest Service (NWCG) counts a "pace" as two steps — every time the same foot lands. The Army counts every step. Pick one and never mix them.

📚 Go deeper: PMS 475, p. 133 — pacing worksheet; FM 3-25.26, p. 52 — pace count and other ways to measure distance.

🏞️ Terrain association: handrails, catching features, aiming off

Match the map to the ground as you go (drawing). It is far more forgiving than walking a compass line, because you keep comparing what you expected to see with what you do see. Pure compass walking piles up errors with every detour (FM 3-25.26, pp. 131, 139). Keep the map turned so its north matches the land (p. 140; by the land; by compass).

Plan a route this way (FM 3-25.26, p. 140):

Aim off on purpose (FM 3-25.26, p. 100; deliberate offset). Heading for a spot on a road or creek, aim about 10° to one side. When you hit the road, you know which way to turn. Each degree moves you about 18 m sideways per 1,000 m walked, so 10° is about 180 m.

Diagram seen from above: instead of walking straight at a spot on a road, walk a bearing about 10 degrees to one side, then turn along the road toward the goal Aim to one side of the spot on purpose; when you reach the road you know which way to turn (a diagram drawn for this guide).

📚 Go deeper: FM 3-25.26, ch. 11 — terrain association in depth; MVUM Wild Rivers — which forest roads are real roads.

📍 Finding yourself on the map (resection)

Resection (FM 3-25.26, p. 68; Position resection; drawing; PMS 475, p. 131):

  1. Orient the map.
  2. Take compass bearings to two or three landmarks you can name on the map.
  3. Turn each into a map bearing (add 14°, unless your compass is already set), then into its back azimuth (±180°).
  4. Draw each line back from its landmark. Where they cross is you. Three lines make a small triangle — you are inside it.

Map diagram: lines drawn back from three named peaks cross in a small triangle where you are standing Resection: back bearings drawn from two or three peaks you can name cross where you stand (a diagram drawn for this guide).

Local candidates are peaks on the FSTopo sheets such as Grayback Mountain, Kerby Peak and Eight Dollar Mountain — check on the sheet which you can really see from where you stand (rule of thumb).

Modified resection (p. 70; drawing): if you know you're on a road, river or ridgeline, one bearing to one landmark is enough. You are where that line crosses your road or ridge.

📚 Go deeper: FM 3-25.26, pp. 68–70 — intersection, resection and modified resection with drawings; PMS 475, p. 131 — finding your own position by triangulation; AFH 10-644, p. 406 — azimuth, biangulation and triangulation.

☀️ Direction without a compass — and how wrong each can be

Method How How far off
Shadow stick Push a 3-ft stick into level ground and mark the shadow tip. Wait 10–15 min and mark it again. The line runs west → east; the first mark is always west. First mark on your left = you face north. Works by bright moonlight too. Gives an approximate east–west line (FM 21-76, pp. 231–232; FM 3-25.26, pp. 102, 141; drawing)
Watch Point the hour hand at the sun. South is halfway between the hour hand and 12 (halfway to 1 on daylight time). The Army warns it can be in error and cause circling — recheck with a shadow stick after an hour (FM 3-25.26, pp. 102–103; drawing). Here the sun is due south about 12:15 PST / 1:15 PDT, give or take up to 16 minutes by season (computed)
Sunrise / sunset The sun rises due east only in March and September (drawing). At our latitude, sunrise is about 32° north of east in late June and 32° south of east in late December (computed)
North Star (Polaris) Follow the two "pointer" stars at the end of the Big Dipper's cup about five times their spacing (Big Dipper and Cassiopeia; northern constellations; Cassiopeia). Within 1° of true north — the best no-compass method. Here it sits about 42° up, a bit under halfway up the northern sky (FM 3-25.26, p. 103; FM 21-76, p. 234)
Moon (phases) Rises before sunset: lit side faces west. Rises after midnight: lit side faces east. Rough east–west only (FM 21-76, p. 233)
Moss — Not a compass — moss can grow all the way around a tree (FM 21-76, p. 235)

Three drawings of the shadow-stick method: mark the tip of a stick's shadow, mark it again later and draw a line through both marks, then stand with the first mark on your left to face north Shadow stick: mark the tip, wait 10–15 minutes, mark it again; with the first mark on your left and the second on your right, you face north (FM 3-05.70, p. 310).

Night sky drawing: lines from the Big Dipper and from Cassiopeia both lead to Polaris, the North Star; an arrow from Polaris down to the horizon marks north Polaris lies off the end of the Big Dipper's cup, on the far side from Cassiopeia's "W"; straight below it is true north (FM 3-05.70, p. 313).

Use Polaris to check your compass on a clear night: it should read about 346° on an unadjusted compass, or 0° once declination is set (worked from 14° E). The noon sun stands about 71° high in June but only about 24° in December, so winter shadows are long (computed for 42° N).

📚 Go deeper: FM 21-76, pp. 231–235 — sun, moon and stars with drawings; FM 3-25.26, pp. 102–103 — field-expedient direction finding.

🆘 Getting un-lost

STOP: Stop, Think, Observe, Plan (Today's Hunter, p. 80):

  1. Stop. Admit you're turned around. Sit down.
  2. Think. Retrace your route in your head: the last place you were sure of, and what you've passed since.
  3. Observe. Look for the five terrain features, a peak you can name, the sound of a road or the river. Try a resection.
  4. Plan. Pick the nearest big handrail on the map (a road or river) and walk a bearing to it, aiming off so you know which way to turn when you reach it.

Trip plan before every trip into the hills (NPS Trip Plan, pp. 1–2): who is going, the route, start and return times, a backup plan, the vehicle and the gear. Leave it with someone who isn't going, check in when you're back, and agree that they act at the deadline.

📚 Go deeper: NPS Trip Plan form — print a stack; Today's Hunter, pp. 80–84 — shelter, fire, signals, cold and heat.

☁️ Reading the sky: clouds, wind and barometer

Clouds that warn (AH 360, pp. 163–164; Cloudwise poster; Sky Watcher chart; List of cloud types):

You see It often means
High, thin wisps (cirrus, photo) thickening to a milky veil (cirrostratus, photo) A warm front and rain coming; from the southwest in spring/summer, often 24–48 hours ahead at Roseburg (Garriott, p. 137)
Rows of small, high puffs (cirrocumulus, photo) from the south or southwest in fall/winter Rain in 12–24 hours (same page)
Turreted, castle-top clouds (castellanus) in the morning Thunderstorms that afternoon
Smooth, lens-shaped clouds over the ridges (lenticular, photo) Strong winds aloft
Towering cumulus growing into an anvil (cumulonimbus, photo) Thunderstorm, lightning, a gusty "gust front" that can arrive before the rain (AC 00-6B, pp. 167–168)
Low gray layer with steady rain (nimbostratus, photo) Steady rain or snow

Rain falls mainly from cumulus, cumulonimbus and nimbostratus. A thunderstorm cell lives about 30 minutes (life cycle), but its gust front can set off new ones (AC 00-6B, pp. 167–168).

Wind signs:

Barometer: watch the trend, not the number. A drop of more than about 0.06 inch in 3 hours means change is coming; about 0.18 inch or more in 3 hours means a strong storm (general practice). The old Roseburg rule "rain after the barometer falls to 29.90" uses sea-level readings; at our ~1,300 ft an unadjusted barometer reads about 1.3–1.4 inches lower (general practice).

Sayings that hold up (somewhat): "Evening red and morning gray…" (Red sky at morning; photo) has a basis, because weather mostly moves west to east (Garriott, p. 18). Hard, greasy, ragged clouds mean wind (Shifts and Expedients, p. 183). Forecasts weeks ahead from the moon, almanacs or animals "can not stand the test of verification" (Garriott, p. 35).

📚 Go deeper: Garriott 1903 — station-by-station signs for Roseburg, Portland and Eureka; Sky Watcher chart — photos of 27 cloud types; AH 360 — clouds, fronts and mountain winds.

🌦️ Illinois Valley weather through the year

The baseline (NRCS soil survey, p. 5): winter averages 40°F at Cave Junction (record low −6°F, December 1972), with about 24 inches of snow a season in that older record (NOAA's 1991–2020 normal is only about 7 inches); summer averages 67°F, and Grants Pass has hit 108°F. Only about 15% of the rain falls April to September, and summer afternoon humidity runs 25–30%. It cools 3–5°F for every 1,000 ft you climb, and above about 4,500 ft it can freeze in any month. Most winters bring one or two damaging windstorms; every few years a continental air mass from the east brings days well below freezing in winter, or a sweltering week in summer.

Valley fog and inversions (AH 360, p. 35; AC 00-6B, p. 146; EPA Smoke Guide, p. 26; Inversion):

Frost (Garriott, p. 137; AH 360, p. 35): heavy frost follows a high or rising barometer, evening temperature at 40°F or below, clearing sky and light wind. Frost hits low spots first. The mid-slope "thermal belt" stays warmest at night — the best spot for tender crops, and also where wildfires stay active all night.

Winter storms off the Pacific (NRCS, p. 5; Spotter Guide, p. 12): warm storms carrying a long plume of subtropical moisture (an atmospheric river) bring several inches of rain a day, high snow levels and fast-rising rivers (general practice). Cave Junction got 8.12 inches in one day on 22 December 1964. Stay off low crossings and out of creeks when they rise.

Summer thunderstorms are most frequent over the mountains (NRCS, p. 5). In fire season, watch the ridges for smoke for a day or two after lightning (rule of thumb).

Heat: in a hot spell, take regular breaks in shade and drink often; do heavy work in the cool morning (rule of thumb). Heat exhaustion — heavy sweat, pale clammy skin, dizziness, nausea — means shade, rest, water and cool wet cloths. Confusion or collapse is heat stroke, a life-threatening emergency — cool them fast (ATP 4-02.11, pp. 188–189; Field care guide).

East wind = fire weather (AH 360, p. 211; NWS Medford, pp. 14–15; Foehn wind): in late summer and fall, after a cold front, high pressure inland can send strong, dry north-to-east winds downslope, warming and drying as they come. On 7–9 September 2020, Medford's humidity fell to about 7% and Slater Butte (4,600 ft, near where the Slater Fire started south of Takilma and O'Brien) recorded gusts of 55–60 mph. Warning signs: very clear air, warm dry nights, and east wind on the ridges after a front. Pack the car and watch for smoke. Another nearby east-wind fire: the Chetco Bar Fire.

Smoke: inversions hold smoke in the valley at night. With no air-quality reports, judge smoke by how far you can see (EPA Smoke Guide, pp. 95–96) — in daylight, not at sunrise or sunset, only when humidity is under 65%, looking at dark landmarks at known distances:

Farthest dark landmark you can see Healthy adults Children, elders, pregnant, heart or lung disease
More than 10 miles Watch for changes Watch; shorten activity if you feel it
5–10 miles Shorten and ease outdoor work Minimize or avoid outdoor activity
Under 5 miles Minimize or avoid outdoor activity Stay indoors in cleaner air

📚 Go deeper: AH 360 — inversions, slope winds, east winds; NWS Medford Sept 2020 — the Labor Day east wind, hour by hour; EPA Smoke Guide, p. 61 — a cleaner-air room.

⚡ Lightning safety

(Backcountry Lightning, pp. 1–2; NWS Lightning brochure, p. 2; Spotter Guide, p. 13)

📚 Go deeper: Backcountry Lightning — picking terrain, group spacing, the lightning position; NWS brochure — family rules and first aid.

📓 A simple home weather log

With no forecasts, your own notes teach you the local signs. Read the same things at the same times every day, say 7 am and 5 pm (rule of thumb):

Date Time Temp °F Barometer (3-hr change) Wind from (clouds / ridgetop) Clouds Rain (in) Farthest landmark seen Notes: fog, frost, thunder, smoke

📚 Go deeper: Garriott 1903 — which sayings hold up and why; Cloudwise poster — print and post next to the log.

⚠️ Old advice in the library to ignore

Book and page What it says Do this instead
ODFW Today's Hunter instructor guide, p. 37 Magnetic north is "in the Hudson Bay area" Long out of date — it is now near the geographic pole, on the Siberian side (general practice). Use the declination printed on the newest map: 14° E.
Any older local map Larger declination numbers Use 14° E (2024–2026 value).
FM 21-76, p. 235 Tree rings are wider on the south side Don't rely on it — ring width depends mostly on slope, lean and crowding (general practice).
Today's Hunter (NY), p. 80 Shelter under a rock overhang; you'll be "found in a few days" Never use an overhang in a thunderstorm. No one is coming unless someone has your trip plan.
FEMA Are You Ready? 2004, p. 75 80 lightning deaths a year Out of date: about 30 a year now (NWS, p. 2).
Garriott 1903, p. 27 "Three foggy mornings indicate rain (Oregon)" Often fails here in winter, when valley fog sits under high pressure for days with no rain.
Garriott 1903, p. 137 Rain when the barometer reaches 29.90 Sea-level readings. Watch the 3-hour trend on your own barometer.
AH 360 (1970) Fire-control procedures Predates satellites and modern fire-danger ratings. Weather science sound; fire tactics are history.
FM 3-25.26, p. 102 / FM 21-76, p. 233 Watch method for direction Rough; can make you walk in circles. Check with a shadow stick or the North Star.

📚 Go deeper: FM 3-25.26, ch. 6 — current Army methods for direction and declination; NWS lightning brochure — up-to-date lightning facts.

🖼️ Pictures & diagrams

Look before you try it. 🖼️ = drawings in the books on this drive; 📷 = photos in the offline Wikipedia.

Reading the map

Compass and declination

Finding your way and finding yourself

Direction without a compass

Clouds, fronts and wind

Local weather and lightning

↑ Contents