Step-by-Step Rally Navigation: Mapping a 200-km Off-Road Course Using Free Tools

You’ve got a weekend, a hungry engine, and a thirst for adventure. The only thing missing is a solid map that won’t leave you stuck in a ditch. That’s why I’m breaking down how to plot a 200‑km off‑road rally using tools that cost nothing but your time.

Why a Good Map Matters

A rally isn’t just about speed; it’s about knowing where the next turn, creek, or steep climb is coming. A bad map can turn a fun ride into a costly rescue. With free tools you can get the same level of detail that paid services offer, and you’ll learn a lot about your own route in the process.

Tools You’ll Need

All of these are free, work on Windows, macOS, or Linux, and have plenty of tutorials online.

Step 1 – Define Your Start and End Points

Pick a Launch Spot

I usually start at a known rally base or a campsite with easy access. Write down the exact latitude and longitude. In Google Earth, right‑click the spot and choose “Copy Coordinates.” Paste them into a text file – you’ll need them later.

Choose a Finish

Do the same for your finish line. If you plan a loop, the finish can be the same as the start. Having both points saved makes the distance check simple.

Step 2 – Sketch a Rough Line in Google Earth

1. Open Google Earth and click the “Add Path” button (the squiggly line icon).
2. Click on the map to drop points along the way you think you’ll drive. Don’t worry about perfection; this is just a rough sketch.
3. When you’re done, right‑click the path, select “Properties,” then “Measurements.” Google Earth will show the total length. Aim for around 200 km. If you’re over, trim a few sections; if you’re under, add a side loop or a detour.

Step 3 – Pull in Trail Data from OpenStreetMap

OpenStreetMap is a gold mine for off‑road trails, forest roads, and even seasonal tracks.

1. Go to openstreetmap.org and use the search bar to locate your start point.
2. Click “Export” and choose “Manually select a region.” Draw a box that covers the whole area of your rough line.
3. In the “Format” dropdown, pick “GPX.” This gives you a file of all the mapped ways (roads, tracks) inside the box.
4. Save the GPX file to your computer.

Step 4 – Merge Your Sketch with OSM Data

Now we need a single file that contains both your hand‑drawn line and the official trail data.

1. Open GPS Visualizer (gpsvisualizer.com).
2. Under “Convert a file,” click “Choose File” and select the GPX you just saved from OSM.
3. Click “Add another file” and choose the GPX you exported from Google Earth (the rough line).
4. In the “Output format” dropdown, pick “GPX.”
5. Click “Convert.” The result is a combined GPX that holds both sets of data.

Step 5 – Clean Up the Route in QGIS (Optional but Recommended)

If you have a spare afternoon, fire up QGIS. It looks intimidating, but you only need a few clicks.

1. Drag the combined GPX into QGIS.
2. Turn on the “Snapping” tool (found under the “Edit” menu). Set it to snap to the nearest OSM trail within 10 meters.
3. Use the “Vertex Tool” to pull any stray points onto real trails. This step removes gaps where the OSM data might be missing.
4. When you’re happy, right‑click the layer and choose “Export → Save Features As…”. Save as a new GPX called “final_route.gpx”.

If you skip QGIS, you can still use the combined GPX, but be ready for a few dead‑ends on the day.

Step 6 – Check Elevation and Difficulty

Elevation is the hidden enemy in off‑road rallies. A steep climb can chew up fuel and tires fast.

1. Open the final GPX in Google Earth again. Right‑click the route and select “Show Elevation Profile.”
2. Look for sections that climb more than 10 percent grade. Mark those on a notepad – they’ll be your caution zones.
3. If a climb looks too brutal, go back to QGIS or GPS Visualizer, drag the route to a gentler side trail, and re‑export.

Step 7 – Add Waypoints for Key Features

A good rally map tells you where to expect water crossings, fuel caches, or scenic pull‑outs.

1. In Google Earth, right‑click a spot you want to note and choose “Add Placemark.”
2. Name it (e.g., “River Crossing – 45 km”).
3. Save all placemarks into a single KML file.
4. Use GPS Visualizer to merge the placemark KML with your final GPX. The result is a single file that holds the route and all the important points.

Step 8 – Load the GPX onto Your Navigation Device

Most rally‑ready phones, Garmin units, and even some car stereos accept GPX.

1. Connect your device via USB or use Bluetooth, depending on the model.
2. Copy the final GPX into the “Tracks” or “Routes” folder.
3. In the device’s menu, set the route to “active” and enable “show elevation” if available.

Do a quick test drive around your driveway or a nearby farm road. Make sure the device follows the line and that the waypoints pop up at the right distances.

Step 9 – Do a Short Recon (Optional but Wise)

If you have a day before the rally, drive the first 20‑30 km. Look for:

• Unmarked obstacles (fallen trees, new fences).
• Changes in trail condition (mud, sand, rocks).

Update the GPX on the spot if you find a better line. A small tweak now can save hours later.

Step 10 – Pack, Fuel Up, and Go

You’ve spent hours mapping, but the real fun starts when the engine roars. Keep a printed copy of the route as a backup – old school, but it works when the battery dies. And remember, the best rally is the one you finish with a smile and a story worth telling at the next meetup.

Happy trails!