USPSA // TRACKER

Terms & Permissions

Why We Need Permissions

🎙️

Microphone

Detects gunshot sounds by analysing audio levels in real-time. Also used for voice command recognition ("Shooter Ready", "Standby", etc.). Audio is processed entirely on your device and is never recorded, stored, or transmitted.

📡

Motion Sensors

Accelerometer and gyroscope data is used to track your movement through a stage (dead reckoning) and to detect recoil impulse for shot confirmation. Sensor data is processed locally and never leaves your device.

📍

Location (GPS)

Used to overlay your movement path on a satellite map so you can review your stage approach. GPS coordinates are stored locally on your device only and are never transmitted to any server.

Privacy

All run data is stored on your device using browser local storage only.
No data is ever sent to any external server or third party.
No account, login, or personal information is required or collected.
Clearing your browser data will permanently delete all stored runs.
Satellite map tiles are loaded from Esri's public tile service. Your GPS coordinates are not included in these requests.

Safety Disclaimer

This app is a training and analysis tool only. It is not a safety device and must not be used as one.
All range safety rules and range officer commands take precedence over this app at all times. Never allow this app to distract you from safe firearm handling.
Shot detection may produce false positives or miss shots depending on ambient noise and phone placement.
Voice recognition may fail to detect or may misinterpret range officer commands. Always respond to commands as issued, regardless of what this app displays.
You are solely responsible for the safe and lawful use of any firearm at all times.

Accuracy

Movement paths are approximate. IMU dead reckoning and GPS both have inherent inaccuracies, particularly in confined bays or near metal structures.
Split times and shot counts may be inaccurate due to ambient noise, phone placement, or device hardware limitations.
This app is not intended for official scoring, timing, or competition use.

Terms of Use

You must comply with all applicable laws and regulations regarding firearm ownership and use in your jurisdiction.
This app is provided as-is, without any warranty of any kind, express or implied.
The developers accept no responsibility or liability for any damage, injury, loss, or consequence arising from the use of this app.
By tapping "I Accept" you confirm that you have read and understood these terms, and agree to use this app at your own risk.

RUN

MOVEMENT

HISTORY

HOW TO

LEGAL

SETTINGS

Waiting for permissions…

0.00

shots

Mic level

Last split

—

Heading

—°

Steps

Movement path appears here after a run.

GPS: —

Overview

Mount your phone on your belt (right hip, screen facing out). The app listens for range commands to automatically track your run — time, shots, and movement path.

Run Flow

1. RO says "Shooter Ready?" — IMU zeros

2. RO says "Standby" — device arms

3. Buzzer sounds — timer starts automatically

4. Shoot — each shot is detected and timestamped

5. RO says "If clear" or "Unload" — run stops

Voice Commands

"Shooter Ready" Zero IMU

"Standby" Arm device

"Buzzer" Start run (testing)

"Bang" Register shot (testing)

"Stop" End run

"If clear" / "Unload" End run

Shot Detection

Shots are detected by a combination of mic level spike and IMU recoil impulse. Both must trigger within 30ms of each other. If shots are being missed or falsely triggered, adjust Mic threshold and IMU threshold in Settings.

Movement Tab

After a run, open the Movement tab to see your path. The trace fades from green (start) to red (end). Numbered markers show where each shot was fired. You can also import any previously exported JSON run file.

Manual Start

Tap Manual Start on the Run tab to skip voice commands and start immediately. Useful if voice recognition is unavailable or disabled.

Tips

• Keep the phone screen facing outward on your right hip

• Grant mic + motion permissions when prompted

• Use English (UK) in Settings if you have a British accent

• Enable Show raw IMU in Settings to verify motion data is being received

• Use "Bang" and "Buzzer" for dry fire practice

Why We Need Permissions

🎙️

Microphone

Shot detection and voice commands. Audio is analysed in real-time on your device and is never recorded, stored, or transmitted.

📡

Motion Sensors

Accelerometer and gyroscope for movement tracking and recoil detection. Processed locally, never transmitted.

📍

Location (GPS)

Overlays your path on a satellite map. GPS coordinates are stored on your device only and never transmitted.

Privacy

• All data is stored on your device via browser local storage only.

• No data is ever sent to any external server or third party.

• No account, login, or personal information is required or collected.

• Clearing your browser data will permanently delete all stored runs.

• Satellite map tiles are loaded from Esri's public service. Your GPS coordinates are not included in tile requests.

Safety Disclaimer

• This app is a training and analysis tool only. It is not a safety device.

• All range safety rules and range officer commands take precedence at all times.

• Never allow this app to distract you from safe firearm handling.

• Shot detection may produce false positives or miss shots.

• Voice recognition may fail to detect or misinterpret range commands. Always respond to commands as issued.

• You are solely responsible for the safe and lawful use of any firearm.

Accuracy

• Movement paths are approximate. IMU and GPS both have inherent inaccuracies, particularly near metal structures.

• Split times and shot counts may be inaccurate due to ambient noise or device limitations.

• This app is not intended for official scoring, timing, or competition use.

Terms of Use

• You must comply with all applicable laws regarding firearm ownership and use in your jurisdiction.

• This app is provided as-is, without any warranty of any kind.

• The developers accept no responsibility or liability for any damage, injury, loss, or consequence arising from use of this app.

Your acceptance

Checking…

Terms v1.0 · USPSA Tracker · Built with Claude

Shot Detection

Mic threshold

Raise if false triggers; lower if missing shots

IMU threshold

Recoil impulse g-force trigger

Refractory period

Min ms between shots

150

PDR

Stride length (m)

Average step distance

0.72

Step threshold (g)

Accel peak to count a step

1.2

Mode

Range

Mic + IMU shot detection and voice commands

Dry Fire

Voice commands only — say "Bang" to register a shot

Voice Trigger

Enable voice trigger

"Shooter Ready" zeros IMU, "Standby" arms

Language

Speech recognition locale

Debug

Show raw IMU

Version History

v1.9
+ Legal gate on first launch (terms must be accepted)
+ Legal tab with permissions, privacy, safety & terms
+ Acceptance stored locally; can be reset from Legal tab
v1.8
+ Heading chevrons on canvas path (relative, ~every 2s)
+ Bearing arrows on GPS/satellite map (absolute north-up)
v1.7
+ Dead reckoning uses e.acceleration (gravity-free linear accel)
+ Position updates on stride detection, not continuous proxy
+ Tighter ZUPT threshold using clean linear accel signal
+ Raw IMU debug shows linear accel magnitude
v1.6
+ GPS movement tracking with satellite map overlay
+ Shot markers pinned to GPS coordinates on map
+ GPS accuracy indicator (green ≤8m, orange >8m)
+ Falls back to IMU canvas when GPS unavailable
v1.5
+ Range mode: mic/IMU + voice commands
+ Dry Fire mode: voice commands only, movement still tracked
v1.4
+ Instructions (HOW TO) tab added
+ "Buzzer" voice command to start run
+ "Bang" voice command to register shot
+ "Stop" voice command to end run
+ Fixed speech restart freeze when switching language
v1.3
+ Movement tab replaces Stage Map
+ Path recorded continuously (no longer step-dependent)
+ Green→red gradient trace, start/end markers
+ Import JSON run files into Movement tab
+ Fixed canvas size initialising at 0×0
v1.2
+ English (UK) language option for speech recognition
+ Voice trigger checks all speech alternatives (accent fix)
+ Fixed "aborted" error on speech restart
v1.1
+ Dual mic + IMU shot detection
+ PDR step-based movement tracking
+ Stage map with wall/target drawing tools
+ Run history saved to local storage
v1.0
+ Initial release
+ Voice-triggered run flow (Shooter Ready → Standby → Buzzer)
+ Mic-level shot detection and split times
+ JSON export