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### GPS Speed Tracking

- Real-time speed display using GPS location services

- High accuracy with best-available GPS precision

- Automatic unit selection based on your region (MPH or KPH)

- Weak GPS warning alerts you when signal quality is poor

- Smooth speed transitions with intelligent interpolation

### Dual Performance Modes

- City Driving Mode: Optimized for frequent starts and stops with aggressive acceleration tracking

- Highway Mode: Statistical filtering for smooth, steady cruising speeds

- Quick toggle: Triple-tap the screen to switch between modes while driving

- Real-time algorithm data: 5-tap gesture reveals advanced speed metrics

### Three Display Modes

- Dark Mode: Classic black background with red text - perfect for night driving

- Light Mode: White background with black text - optimal daytime visibility

- Custom Mode: Create your own color scheme with full background and text color customization

### Font Selection (11 Options)

Choose from professionally selected fonts optimized for speed reading:

- Digital-7 (LED) - Authentic 7-segment speedometer look

- SF Pro - Apple's optimized system font

- SF Mono - Monospaced for stable digit display

- Helvetica Neue - Clean, modern sans-serif

- Avenir Next - Modern geometric with excellent readability

- Gill Sans - Classic British heritage font

- Copperplate - Premium, luxury all-caps

- Futura - Art deco geometric style

- DIN Condensed - Industrial technical aesthetic

- Menlo - Monospaced coding font

- Silom - Technical monospaced font

### Font Sizes

- Small: 50% of screen - compact display

- Medium: 70% of screen - balanced visibility

- Large: 90% of screen - maximum readability

### Display Orientation

- System Setting: Follow device auto-rotate

- Lock Portrait: Always vertical orientation

- Lock Landscape: Always horizontal orientation

### Customizable Display Elements

Each element offers three visibility modes: Always Show, Never Show, or Auto-Hide

#### Speed Display

- Large, clear speed reading in your chosen font

- Two-digit format for clean appearance

- Automatic zero detection eliminates GPS drift when stationary

#### Unit Label

- MPH or KPH display below speed

- Auto-hide after 3 seconds for cleaner display

- Tap to reveal when hidden

#### GPS Accuracy Indicator

- Real-time accuracy reading in meters

- Location icon with precision value

- Helps assess reading reliability

#### Current Time

- 12-hour format display

- Top-left corner positioning

- Auto-hide capability

#### Battery Status

- Percentage display with icon

- Charging indicator when plugged in

- Smart icon shows battery level visually

- Low battery notifications (optional)

#### Heading/Direction

- 8-direction compass (N, NE, E, SE, S, SW, W, NW)

- Top-center display

- Updates based on movement direction

#### Settings Icon

- Quick access to all settings

- Optional auto-hide for distraction-free display

- Tap screen to reveal when hidden

### Auto-Hide Timing

- 1 second - Very quick fade

- 3 seconds - Default balanced timing

- 5 seconds - Extended visibility

### Focus Mode Awareness

- Automatic detection of iOS Focus mode status

- Smart suppression - notifications pause when Focus is active

- Zero distraction during Driving focus or Do Not Disturb

- Real-time status indicator in settings

### Notification Types

- GPS Signal Lost: Alert when GPS accuracy degrades

- GPS Signal Restored: Confirmation when signal quality improves

- Speed Warnings: Customizable speed alerts (ready for implementation)

- Low Battery Warnings: Get notified before battery runs out

### Full Control

- Master toggle to enable/disable all notifications

- Permission management built into app settings

- Tap-to-authorize easy permission request

- Privacy-focused - all notifications are local to your device

### Screen Management

- Keep Screen On: Prevents sleep while app is active - essential for continuous speed monitoring

- Custom Brightness: Override system brightness for optimal outdoor visibility

- Brightness slider: 0-100% manual control

- System brightness option: Use device auto-brightness

### Performance Optimization

- Font caching for smooth, lag-free updates

- Efficient GPS processing minimizes battery drain

- Optimized rendering for 60 FPS display updates

- Smart filtering reduces unnecessary screen refreshes

### Swipe Controls

- Swipe Left: Cycle forward through display modes (Dark → Light → Custom)

- Swipe Right: Cycle backward through display modes

### Tap Gestures

- Single Tap: Reveal hidden display elements

- Double Tap: Reset speed algorithm to raw GPS data

- Triple Tap: Toggle between City Driving and Highway modes

- 5x-Tap: Toggle Advanced Info overlay with real-time algorithm data

### Speed Algorithm Options

- City Driving: Best for 0-60mph

- Highway Mode: Best for highway speeds and cruising

### Speed Validation

- Threshold filtering eliminates GPS drift at standstill

- Outlier detection rejects anomalous readings

- Position delta checking verifies actual movement

- Trend prediction anticipates acceleration/deceleration

- Consecutive reading validation prevents false starts

### Advanced Info Overlay

5-tap gesture reveals real-time diagnostics:

- Raw GPS speed vs. filtered display speed

- Current threshold value

- Detected trend (accelerating/decelerating/stable)

- GPS accuracy in meters

- Confidence level indicator

- Algorithm-specific metrics (Kalman gain, acceleration, etc.)

### Privacy-First Design

- No data collection - we don't collect, store, or transmit any personal data

- Local processing only - all calculations happen on your device

- No analytics - no tracking, no third parties, no servers

- No user accounts - no passwords, no login required

- Complete control - you own your data

### Data Storage

- Local preferences only - settings stored in iOS UserDefaults

- No location history - GPS data used in real-time only

- No trip recording - no route tracking or logging

- Uninstall = complete deletion - removing app deletes all data

### Requirements

- iOS 15.0 or later for full Focus mode support

- iPhone (optimized for all screen sizes)

- GPS capability required for speed tracking

### GPS Performance

- Best accuracy mode for highest precision

- 1-meter distance filter for responsive updates

- Horizontal accuracy tracking for quality assessment

- Multiple algorithm options for different use cases

### Display Specifications

- Dynamic font scaling adapts to all screen sizes

- Portrait and landscape support

- Status bar hidden for maximum display area

- 60 FPS refresh rate for smooth updates