GPS Lap Timer

"GPS Lap Timer" is a lap timer for race tracks using the GPS function of iPhone.
You can easily and accurately measure lap times and sector times using only your iPhone. No external GPS receiver is required.
GPS lap timer accuracy is not determined by GPS update frequency alone.
This app achieves highly accurate lap timing using proprietary measurement algorithms.
Approx. 10,000 laps will be saved.

(How to use)
Please see "https://ameblo.jp/miravan2008/entry-12785734917.html”.

(Measurable circuits) Planned to be added. Please let us know if you have any requests. Please also report any bugs or issues.
 (United States) 
Blackhawk Farms Raceway
Added the following circuits of United States:
- Buttonwillow Raceway Park (BRP) -
BRP Kart CCW/CW1,2,6,7,8,9,Oval1,Oval2
BRP Race CCW/CW1,13,14,15,16,18,25,26
BRP Race CCW/CW2,3
BRP The Circuit CCW/CW
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
 (United Kingdom) 
Brands Hatch GP Circuit
Brands Hatch Indy Circuit
Donington Park Circuit
Oulton Park Circuits
Silverstone Grand Prix Circuit
Silverstone International Circuit
Silverstone National Circuit
Silverstone Stowe Circuit
 (Australia)
Sydney Motorsport Park (Brabham, Gardner GP, Druitt North)
Sydney Motorsport Park Amaroo South
 (Germany)
Nürburgring Nordschleife
Nürburgring Nordschleife (BTG)
 (France)
Circuit Paul Ricard
 (Malaysia)
Sepang International Circuit
 (Thailand)
Chang International Circuit
 (Taiwan)
Lihpao G2 Circuit

(Japan) 
Please see "https://ameblo.jp/miravan2008/entry-12785734917.html”.

(About mounting the iPhone)
- Mount the iPhone to the machine where the iPhone screen can be seen by the driver/rider. It can be mounted either vertically or horizontally.
- For 4-wheel machines, GPS reception is more stable under the windshield than under the roof.
- If you don't need to see the time while driving, you can put the app in stand-by mode and put the iPhone in your pocket.

(iPhone settings)
- Turn on Location Services.
- Allow LOCATION ACCESS to LapTimer.
- Turn on Precise Location.

(Remarks)
- Lap times are recorded together for each session. Approx. 10,000 laps are saved, and when the capacity is exceeded, the oldest lap times are deleted. 
- When you tap the button, a dialog will appear to prevent the measurement from ending suddenly. Also, an option selection dialog may appear.
- If GPS reception is poor, operation may become unstable.
- This app relies on the iPhone's GPS for lap timing. If GPS data cannot be obtained accurately, the app may not function correctly.
- It is not possible to measure in reverse direction.
- 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/