GPS Lap Timer vs OBD Gear Indicator

• "GPS Lap Timer" is a lap timer app for racing circuits that utilizes the iPhone's GPS function. • Easily and accurately measure lap times and sector times using only your iPhone. No external GPS receiver is required. • The accuracy of a GPS lap timer is not determined solely by the GPS update frequency. This app achieves highly accurate lap time measurement through its unique measurement logic. • Approximately 10,000 measured lap times are saved and can be viewed and shared. • Enjoy a fulfilling racing life with this app! (How to use) Please see "https://gpslaptimer.blogspot.com/2026/08/gps-lap-timer-free-ios-app.html”. You can also access it from “Settings” → “User Guide” in the app. (Measurable circuits) Planned to be added. Please let us know if you have any requests. Please also report any bugs or issues. (Australia) Sydney Motorsport Park (Brabham, Gardner GP, Druitt North) Sydney Motorsport Park Amaroo South (Canada) Calabogie Motorsports Park CTMP Driver Development Track CTMP Grand Prix Track CTMP Karting Track (CCW) CTMP Karting Track (CW) Toronto Motorsports Park (CCW) Toronto Motorsports Park (CW) (France) Circuit Paul Ricard (Gernany) Nürburgring Nordschleife Nürburgring Nordschleife (BTG) (Japan) Please see “https://ameblo.jp/miravan2008/entry-12980388291.html”. (Malaysia) Sepang International Circuit (Taiwan) Lihpao G2 Circuit (Thailand) Chang International Circuit (United Kingdom) Oulton Park Circuit Silverstone International Circuit Silverstone Grand Prix Circuit Silverstone Stowe Circuit Silverstone National Circuit Donington Park Circuit Brands Hatch GP Circuit Brands Hatch Indy Circuit (United States) Blackhawk Farms Raceway BRP Kart CCW1 BRP Kart CW1 BRP Race CCW1 BRP Race CW1 BRP Race CCW2 BRP Race CW2 BRP The Circuit CCW (Buttonwillow Raceway Park) BRP The Circuit CW (Buttonwillow Raceway Park) Laguna Seca Road America Sebring Raceway GP Road Course Sonoma Raceway Summit Point Motorsports Park (Main) Summit Point (Jefferson Circuit CCW) Summit Point (Shenandoah Circuit CCW) VIR Grand∙Full Course VIR North Course VIR South Course VIR Patriot Course Waterford Hills Road Racing The developer assumes no responsibility for any accident, violation, loss or claims by third parties which may arise from the use of this app. Terms of Use: This application is provided under the Apple Standard End User License Agreement (EULA). https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

REQUIRED HARDWARE: This app needs a Bluetooth LE (BLE) ELM327-compatible OBD-II adapter. The adapter is sold separately and is NOT included. Without one the app cannot read your vehicle. Classic Bluetooth (SPP) and Wi-Fi adapters do not work on iOS. BUILT FOR PRACTISING HEEL-AND-TOE Rev-matched downshifting is normally learned by feel: nothing in the car tells you what engine speed the lower gear actually wants. OBD Gear Indicator calculates it and shows it live, so you practise against a number instead of a guess. When a downshift becomes possible, a bar appears with the engine speed the next lower gear needs at your current road speed. Blip the throttle, watch the marker slide toward the centre, and release the clutch when it turns green. The target is recalculated continuously while you brake, so it follows the speed you are actually at. - A number instead of a guess. You learn what 4,200 rpm at 60 km/h in third actually feels like. - Smoother downshifts. Matching the engine to the gear removes the driveline shock, and the mid-corner upset a mismatched clutch release causes. - Less wear. Every mismatched downshift is absorbed by the clutch. Matching first means the clutch is not used as a brake. - Adjustable tolerance. Decide how close counts as matched: a tight band for practice, a wider one for everyday driving. - Switch it off and check yourself. Practise with it, then turn it off and see how close you still get. DISPLAY - Large gear number in the centre of the screen, sized automatically to the space available - 12-segment RPM LED bar with a configurable start and full-scale engine speed - Longitudinal G bar showing acceleration and braking in real time, with peak values held briefly - Portrait and landscape layouts - Four gear number typefaces (Analog, Racing, 7-segment, 14-segment) and six colours - Plain black screen designed to be read at a glance; the display stays awake while in use TWO WAYS TO KNOW THE GEAR - Auto learning: start at a standstill so the idle speed is recorded, then shift up in order, holding a steady speed for ten seconds in each gear. The app learns each gear's RPM-to-speed ratio and keeps it on the device. Learned values and the per-gear detection window can be edited by hand. - Enter gear ratios: type in the transmission ratios, final drive ratio and tyre circumference instead. No learning drive needed. DEMO MODE Demo mode runs the gear number and the RPM LEDs with no adapter and no vehicle. The G bar still follows your device's real motion. PRICING Free to download. The gear display is free. A one-time US$4.99 purchase adds the RPM LED bar, rev-match indicator and G-force bar. Not a subscription. Demo Mode stays free. HOW IT WORKS, AND WHAT IT CANNOT DO This app estimates the current gear from engine RPM, vehicle speed and throttle position read over OBD-II. It does not read gear position directly from the vehicle or the gearbox. Because it is an estimate, the gear shown can be wrong while the clutch is disengaged or when sensor conditions are poor. OBD-II communication itself adds at least about 50 milliseconds between reading the vehicle and drawing the screen. Any delay beyond that comes from the adapter, and ELM327-compatible products vary enormously: an adapter with high response latency will visibly increase both the lag and the error in what is displayed. If the gear reading feels slow or unstable, the adapter is the first thing to change. The display is reference information only. It never takes priority over the vehicle's own instruments or your awareness of your surroundings. Do not look at or operate the screen while driving; change settings only while stopped. WHAT YOU NEED - A Bluetooth LE (BLE) ELM327-compatible adapter, sold separately. A low-latency one is strongly recommended. - A vehicle with an OBD-II port that reports engine RPM, vehicle speed and throttle position. - A manual transmission, for the rev-match indicator to be useful.