1. Complete & Detailed Technical Guide: Operating the GPS Circuit Lap Timer

Dedicated optical transponders and proprietary motorsport data loggers cost hundreds of dollars and require messy dashboard wiring. Whether you are running a weekend track day, karting session, or autocross circuit, this browser-based motorsport telemetry cockpit turns your smartphone into an automatic GPS lap timer and speed logger. Here is your step-by-step operational walkthrough from pit lane to checkered flag:

1. Select Your Speed Unit (KM/H or MPH): At the top-left header, switch between KM/H and MPH. You can toggle between metric and imperial velocity readings at any time—even after a session is completed—and both live speed and peak lap speeds will recalculate automatically.
2. Stage at the Start/Finish Line & Arm Sensor (START SENSOR): Position your vehicle at the circuit's start/finish line or pit-exit trigger point, then tap START SENSOR at the top right. Grant your browser high-accuracy GPS permissions. The live dark-mode map immediately snaps into your circuit boundaries at Zoom Level 18. Once satellite lock is achieved, an acoustic confirmation tone plays, locking your current coordinates as the virtual Start/Finish gate and displaying Grid Locked • Waiting for Launch.
3. Accelerate to Trigger Zero-Noise Motion Launch: You do not need to fumble with your screen while pulling onto a hot track. Thanks to our Zero-Noise Motion Launch filter, the main lap timer stays frozen at 00:00.00 while you sit staged on the grid. The instant your vehicle physically accelerates past 6.0 meters from the start gate or exceeds 1.1 m/s (~4 km/h), Lap 1 begins timing automatically at 25Hz display resolution (00:00.00).
4. Cross the Virtual Finish Gate (Automatic Geofence Lap Detection): Keep your eyes on the apex—not your phone. Every time you complete a full circuit and pass within an 18-meter radius of your initial start/finish coordinates (protected by a 15-second gate cooldown to prevent double-triggering on tight karting tracks), the workstation automatically:
   • Fires a high-frequency In-Helmet Auditory Lap Cue (1400Hz to 800Hz sweep) so you can hear your lap completion through your helmet or car speakers.
   • Logs your official lap time and that specific lap's peak top speed into the Official Lap Times table below, highlighting your fastest run with a green [BEST] badge.
   • Resets the primary chronometer to zero and seamlessly rolls into the next lap.
5. Read Live Pace Delta & Secondary Telemetry: Once you have established a benchmark lap, the DELTA TO BEST gauge compares your current lap's elapsed time against your session's BEST LAP in real time—glowing green when you are under your best time and turning crimson red (+sec) the moment you slip behind pace. Beneath the main HUD, the four-tile matrix tracks your all-session BEST LAP, LAST LAP, PEAK KM/H (or MPH), and total COMPLETED LAPS.
6. Export CSV Telemetry & HD Track Story Cards: Back in the paddock, use the bottom three-button control deck to analyze and share your stint:
   • Tap Export CSV to download a clean spreadsheet-ready .CSV file listing every lap number, official lap time, peak speed achieved on that lap, and a Best Lap flag.
   • Tap Story to render and download a high-resolution PNG telemetry card showing your circuit map racing line, best lap time, and peak speed.
   • Tap Reset to clear the current racing line and lap table before your next session out on track.

2. Practical Use Cases: Who Is This Motorsport Cockpit Built For?

Engineered for zero-distraction operation inside a moving cockpit or under a racing suit, this GPS lap timer adapts across multiple motorsport disciplines:

1. Track Day Drivers & Time Attack Enthusiasts: Mount your phone securely on the windshield or center console to record automatic lap times, monitor peak straightaway speeds, and review CSV consistency between stints without buying expensive hardware transponders.
2. Go-Kart & Rental Kart Racers: Slip your phone into a secure chest pocket with earbuds in—let the automatic 6-meter motion launch and audible in-helmet lap beep track your session completely hands-free.
3. Motorcycle Track Riders & Supermoto Pilots: Log clean circuit polylines and compare lap-by-lap top speeds in the paddock after every 20-minute session.
4. RC Car, Drone & Closed-Course Testers: Set up an instant, portable geofence start/finish gate on any closed parking lot or private test loop in seconds.

3. The kelana.net Advantage: Why This Lap Timer Stands Apart

Most mobile lap timer apps force you to download gigabytes of pre-mapped circuit databases, register a mandatory cloud profile, and pay recurring monthly subscriptions just to unlock CSV exports or see your best-lap delta. At kelana.net, our heritage is built on pure, unhindered chronometer precision:

1. 100% Client-Side Execution (Zero-Cloud Trackside Privacy): Your telemetry logs, peak speeds, and GPS coordinates are processed exclusively inside your device's local browser memory (RAM) using native Web Geolocation, Web Audio, and Canvas APIs. Nothing is ever transmitted to an external server, meaning your track data stays 100% private.
2. Frictionless by Principle (No Sign-Ups, Works on Any Circuit): Because our engine dynamically anchors the start/finish geofence wherever you arm the sensor, you never have to wait for a custom track map to be approved in a cloud database. Open the browser at any circuit, karting loop, or private course in the world—zero accounts, zero passwords, and zero paywalls.
3. Offline Paddock Reliability & Zero-Glare Ergonomics: Race tracks are often located in rural areas with congested or weak cellular towers. Once loaded, this workstation talks directly to your phone's internal GNSS satellite receiver without needing a continuous 4G/5G data connection, while the high-contrast dark cockpit eliminates windshield glare during twilight or night stints.

4. Final Thoughts: Chase Tenths, Not Subscriptions

Shaving tenths of a second off your personal best requires focus, consistency, and honest telemetry. The GPS Circuit Lap Timer strips away the hardware clutter and subscription walls of traditional motorsport loggers, putting an automatic, geofence-triggered chronometer right on your dashboard.

Bookmark this cockpit on kelana.net before heading to the paddock, stage your vehicle at pit exit, and let the satellites clock your laps. Whenever you need fast, private, and uncompromised timing precision, your browser workstation is green-lit and ready to race.