Grid to GroundLand Navigation Trainer
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Pine Creek

1:25,00010S FH

Calculator

Field guide

Learn
Use Show hint and on-screen tips.
Practice
Work on your own, then check each answer.
Take test
Build a test and get your score at the end.
Map controls & symbols
  • Move. Drag to pan. Pinch or use + and − to zoom. Use the fit button to reset the view or refocus on the terrain question.
  • Pin. For pin questions, tap the map to place or move your pin. With the map focused, use arrow keys to aim and Enter to pin.
  • Choose a map. Pick a 12 × 8 km training map by name and scale. Random maps switches after each drill or full course.
  • Read the grid. Bold lines mark 1 km squares. In Learn, plotting and reading drills add 100 m and 10 m lines as you zoom. Practice and tests keep the 1 km grid.
  • Read the legend. Brown curves show contours, blue shows water, dashes mark trails, and diamonds mark survey points. Use the scale bar to estimate distance.
Plot & read grids

Read right, then up. Easting goes right and northing goes up. 10S FH names the grid zone and 100 km square.

Plot 286 438. Start where lines 28 and 43 meet. Go 600 m right and 800 m up.
  • Choose 6-digit for 100 m squares or 8-digit for 10 m squares. Eight-digit plots accept taps within 10 m of the square.
  • Plot grids. Tap the square and choose Check pin. After checking, use See on map to inspect the correction.
  • Read grids. Use Zoom to A and enter the grid of the square containing A. Keep leading zeros.
  • In Learn, Grid aids opens the Grid tick guide. It divides a square into tenths.
Protractor
  1. Tap or drag Protractor onto the map. Drag the plate to move it, or tap Protractor again to close it. Drag the orange handle to turn it or tap the handle to straighten it.
  2. For grids, tap the orange handle to straighten the plate. Drag the highlighted triangle’s zero to the southwest corner of the 1 km square.
  3. Slide right until your easting tick meets the west grid line. Place your pin at the northing tick on the vertical edge.

Fit plate frames the protractor. Pan map moves the view while the plate stays put. Tap Move plate to grab it again. A tap inside a clear triangle places a pin; a tap on the plate does not.

Undo restores the last pin, line, or tool adjustment. Your current practice question, notes, and tool positions save on this browser. Reopen a tool to resume its placement.

Keyboard: focus the map and use arrows, then Enter to place a pin. Use + / − to zoom. Focus a tool button and use arrows to move it; focus its orange handle to turn it. Ctrl / ⌘ Z undoes an adjustment outside text fields.

Azimuths & north references
  1. Move the protractor’s center over A and tap the orange handle to align north.
  2. Tap String below the map. Drag the blue handle toward B. The string continues past the handle to the edge of the map view. Read the black degrees where it crosses the scale.

Red shows the back azimuth and the outer scale shows mils. A–B line shows the direction between the points when offered. The map shows grid north (GN), magnetic north (MN), and the angle between them.

Grid to magnetic
Subtract east angles or add west angles.
Magnetic to grid
Add east angles or subtract west angles.
Back azimuth
Add 180°. If you reach 360° or more, subtract 360°.
Turns & mils
Add for right turns and subtract for left. A full circle is 360° or 6,400 mils.
Lensatic compass, distance & pace
  1. Open Lensatic compass. Drag the first tick (0) onto A. Turn the orange handle until the ruler edge runs through B.
  2. Each small tick reads 100 m. Use the reading at B on 1:25,000 maps and double it on 1:50,000 maps. For long or bent routes, add the straight sections.

Fit compass frames the tool. Edge only hides the case. Use Pan map to move the view and Move compass to adjust the tool.

Paper scale
1 cm is 250 m at 1:25,000 or 500 m at 1:50,000.
Paces to count
Meters ÷ 100 × paces per 100 m.
Your pace rate
Paces counted ÷ meters walked × 100.
Walking time
Distance in km ÷ speed in km/h × 60 gives minutes.
Terrain & contours

Answer review. After checking an answer, use See on map. Numbered marks connect the ground view to the same terrain on the map.

Where are you? Note the facing direction above the ground view. Compare the hills and gaps with the map, then choose A, B, or C.

Zoom for detail. Crowded training maps show fewer contours from farther out. Zoom in for the fine lines; the map legend shows the spacing currently drawn.

Hill
Closed loops rise toward the middle.
Ridge
Long crest with lower ground on both sides.
Draw
Low drainage with Vs pointing uphill.
Spur
Finger of high ground pointing downhill.
Saddle
Low gap between two peaks.
Depression
Low bowl with ticks pointing inward.
Resection
  1. Convert each magnetic bearing to grid, then reverse it by 180°. Use Grid back azimuth notes to keep the numbers handy.
  2. Drag the protractor’s center onto the landmark and tap the orange handle to align north. Tap String below the map and aim the blue tip at your back azimuth.
  3. Tap Save line and repeat for each landmark. Use Clear lines to start over.
  4. Pin where the lines cross, or where one line meets the road in a road question. Tap Check position to see the correct lines.
Field course & mixed practice

Field course gives you five steps on one map. Plot the first checkpoint, preview and pick a route, walk a leg, then plot and walk to the final checkpoint.

Enter a magnetic heading and pace count. Walk leg shows where you stop. See course results reviews both legs.

Mixed practice rotates through grids, azimuths, terrain, distance, and resection.

Calculator

Open Calculator from the map toolbar. Use the keypad or your keyboard, then press =. Clear starts a new calculation.

Learning path & tests

Learning path. In Learn mode, choose Start learning for six examples with three practice questions each.

Practice what I missed. After submitting a test, use this button for new coached questions about your missed skills. Your test results stay saved.

  1. Open Take test. Choose 1–100 questions, one or more topics, maps, and grid precision. Shuffle the questions or group them by topic.
  2. At the end, use Review answers to revisit questions by number. Blank answers count as missed.
  3. Tap Submit test for your score and explanations. To pause, open Test menu and choose Resume test to come back.
Open test setup
References
NGA coordinate systems USGS map and compass guide Army map reading manual Lensatic compass reference