RudelRallyOn average. To the second.
RudelRally is average speed calculator, tripmaster, timekeeper and orienteering solver for rallies, orienteering drives and regularity tests. The app measures the distance by GPS, OBD-II or wheel sensor and always shows whether you need to drive faster or slower – to the tenth of a second.
- average calculator
- regularity tests
- tripmaster
- time controls
- orienteering solver
- OBD-II
- watch app
- in-car display
- competition mode
What the co-driver needs
No notepad, no calculator, no second device on the dashboard: RudelRally does the maths while you drive.
Average speed calculator
Enter two of distance, average speed and time, and the third is calculated. The deviation is shown in seconds and metres with an arrow – ↑ faster, ↓ slower, ● on target. Any number of averages can be swiped through as a band; the switch to the next one happens automatically and is announced.
Tripmaster
Partial and total distance, counting backwards after a wrong turn, correction buttons for ±10 and ±100 m and the average since the trip started. Resetting needs a long press – so nothing gets lost by accident.
Time controls and countdowns
An official clock from GPS time, several time controls with target times, countdowns – also chained one after another –, a stopwatch and a speed limit warning. The app counts the last seconds down out loud.
Regularity tests with landmarks
The regularity test as one continuous target time: landmarks with target times, average changes and task time as in the printed table. RudelRally announces the next landmark and, after a wrong turn, works out a catch-up average.
Watch and large display
With a Wear OS watch (Galaxy Watch4 and newer) you start, zero and switch averages and regularity tests from your wrist – the phone stays in its holder. For the cockpit there is RudelRallyDisplay: a 5-inch touch display with an ESP32, connected via Bluetooth. It shows up to nine values in large digits, follows night mode or works as a remote with buttons for zeroing, handover and ±10 m.
Distance from the vehicle
Besides the phone’s GPS, RudelRally measures via an OBD-II adapter (Bluetooth) or the RudelRad wheel sensor – a small ESP32 at the wheel that sends the pulses to the phone via Bluetooth. Each vehicle has its own device and a gear table: RudelRally shows which gear and engine speed hold the target average. On the calibration section the app works out the correction factor.
Orienteering solver
Place arrow, line, dot and half-arrow sketches, fishbones and “Chinese” junction symbols on the map – RudelRally works out the route by the rules: one-way rule, no-crossing rule and permitted roads, based on OpenStreetMap.
Rallies, stages and map
The rally is recorded in one go and divided into stages, with direction arrows on the map and a measuring tool for the straight line or the shortest way along the road. Share GPX files or bring them in as a template.
Backtrack warning
A warning tone when you drive along a section already driven in the opposite direction, or when a road you already took branches off ahead. The section is marked red on the map.
Follow-me for the family
Whoever stays at home sees, about a minute delayed, where you are and which way you drove – end-to-end encrypted via your OneDrive folder, invited by private message.
Practise with the simulator
A virtual driver drives a regularity test, an average or a free speed profile – with stops, wrong turns and fast-forward. The team learns the routines at the kitchen table instead of during the test.
Competition mode
If the rules forbid navigation, RudelRally hides the map, your own position and follow-me. Measuring and recording continue.
Planned: separate roles for co-driver and driver – a second phone in the holder then shows only the arrow and the deviation.
Measure fairly. Reveal nothing.
Many orienteering drives forbid navigation. In competition mode RudelRally therefore shows neither map nor your own position – average, trip and recording keep running as usual.
- Map and own position hidden
- Deviation still in seconds with an arrow
- Tolerance for “on target” freely adjustable
- The rally appears in the list afterwards
Good to know
So that Android doesn’t stop measuring in the background, exclude RudelRally from battery optimisation. And whether a phone is allowed as a measuring device is up to the rules of each event.
No account, no server, no profile
RudelRally stores vehicles, calibration runs, rallies and orienteering tasks on your phone. From the internet the app loads map tiles and road data from OpenStreetMap; follow-me only uses your own OneDrive. All details
Location only while measuring
GPS only runs while you measure or record – visible from the notification.
Your rallies stay with you
Only you can pass a rally on – as a GPX file or encrypted via follow-me to your family.
No ads, no tracking
No analytics, no advertising, no crash reports.
RudelRally for Android
RudelRally is in development. If you’d like to hear when it launches, send me a short e-mail.
- SystemAndroid 7.0 or later
- MeasurementGPS, OBD-II adapter (Bluetooth) or RudelRad wheel sensor
- Watchoptional: Wear OS, e.g. Galaxy Watch4 and newer
- Displayoptional: RudelRallyDisplay (ESP32-S3 with 5-inch touch display, Bluetooth)
FAQ
How accurate is GPS measurement?
Accurate enough for average and trip in most cases, especially after a calibration run. In tunnels, narrow valleys or dense forest GPS gets less accurate; that’s what the correction buttons are for. It gets more accurate straight from the vehicle: via OBD-II about 0.3–1 % is typical after calibration, with the wheel sensor even less.
How do several averages work?
You enter the average speed requirements of a test one after another. When an average reaches its target distance or time, RudelRally switches to the next one and announces it; you can also switch by hand. If you like, the deviation of the previous average is carried over.
I took a wrong turn – now what?
Tap “Reverse”: the distance counts back until you are on the route again. Then it continues as usual.
