# Sidereal Timing Systems

> Centimetre-level GPS timing for motorsport, with nothing to set up beforehand.

Start, splits and finish are virtual lines on a satellite map. One device on each car times every crossing to the millisecond and logs centimetre-level data for the driver, using corrections from one base station at the venue. No beams, loops or reruns.

## Key highlights

- **Timing accuracy**: ±1 ms — Repeatable millisecond timing with zero line drift.
- **Track setup**: 0 cables — Virtual lines on a map. No tripods or buried loops.
- **Driver telemetry**: 2-in-1 Bluetooth — Official transponder and driver data logger in one device.
- **Live results**: Instant — On every phone before the car returns to grid.

- Website: https://siderealtiming.com/
- Interactive live demo: https://demo.siderealtiming.com
- Contact: hello@siderealtiming.com
- Last updated: 2026-10

## Pages

- [Sidereal Timing Systems — RTK-GPS timing for motorsport](https://siderealtiming.com/index.md): Centimetre-level GPS timing for autocross, hillclimb and track days. Virtual start, finish and split lines: no loops cut into the tarmac, no beams to align.
- [Product: RTK GPS Device & Base Station | Sidereal](https://siderealtiming.com/product.md): A device for each car that times and logs data, a venue base station, and cloud race control. RTK GPS, 10 Hz, ±1 cm, LTE included, no trackside cabling.
- [Accuracy & Testing: ±1 ms GPS Timing | Sidereal](https://siderealtiming.com/accuracy.md): How Sidereal's RTK-GPS timing achieves ±1 ms repeatability, how we tested it against optical laser beams, and the audit trail stored for every crossing.
- [Pricing: per-car, per-event GPS timing (CAD)](https://siderealtiming.com/pricing.md): Per-car, per-event GPS timing in CAD with the full fleet included. Series, Championship and Facility & Venue plans, plus 2027 Beta Pilot rates.
- [Frequently asked questions](https://siderealtiming.com/faq.md): Questions organizers and drivers ask.
- [About Sidereal Timing Systems | Alberta, Canada](https://siderealtiming.com/about.md): Sidereal Timing Systems, an Alberta, Canada company, builds RTK GPS timing and data logging for motorsport events of any size. Learn why we're named for star time.
- [Contact and free shadow timing trial | Sidereal](https://siderealtiming.com/contact.md): Tell us what you run. Request a free shadow timing trial alongside your current beams or loops, or reserve fleet capacity.
- [Full documentation](https://siderealtiming.com/llms-full.txt): Every page of the site as one text file, for readers with a large context window.

## Optional

- [Interactive live demo](https://demo.siderealtiming.com): Browser sandbox with live timing leaderboards, splits and race control.
- [DMS Time Trials](https://www.racewithdms.ca): StratoCross (autocross) and StratoSprint (track sprint) series at Stratotech Raceway, Alberta.