Compass vs Master Clock

**Compass is the all-in-one outdoor tool for hikers, cyclists, and explorers.** Accurate magnetic north, GPS speedometer, altitude tracking, activity recording — all in a minimalist, sunlight-readable interface. Core features work fully offline. **Precision Magnetic Compass** - Real-time 360° rotating dial tracking magnetic north - 8 cardinal/intercardinal directions with 1° accuracy - Haptic feedback at each major bearing transition - Built-in level: crosshair shifts with tilt, turns gold when flat **GPS & Coordinates** - Latitude / longitude in DMS format (degrees, minutes, seconds) - Live GPS accuracy and altitude readout - Automatic reverse geocoding — see your location name in real time **Sensor Data Dashboard** - Altitude trend chart (last 30 readings) - Barometric pressure: hPa / kPa / mmHg / PSI - 3-axis magnetometer readings (X/Y/Z in μT) - Boiling point calculator based on current air pressure - Live weather: temperature, humidity, wind speed & direction (Beaufort scale) **Activity Tracker** - 5 types: Walking, Running, Hiking, Cycling, Driving - Real-time route map (Standard / Satellite / Hybrid) - Tracks duration, distance, speed, steps, and calories - Activity history with full route replay **GPS Speedometer** - Analog dial style, up to 300 km/h - Gold sweep arc highlights current speed range - HUD mode: horizontally flipped for windshield projection - Stats: avg speed, top speed, distance, accuracy **Geo Photo Watermark** - Auto-stamp photos with GPS coordinates, altitude, location, temperature & date - Dark / light card style toggle - High-resolution composite saved to Photos library (Pro) **Pro Subscription** - Ad-free · Unlimited activity records · Save geo photos - 3-day free trial · Cancel anytime **About Payment** Payment will be charged to your Apple ID account upon confirmation of purchase. The subscription will automatically renew unless cancelled at least 24 hours before the end of the subscription period. Renewal charges will be applied to your account within 24 hours prior to the end of the current subscription period. After purchase, you can manage and cancel your subscription in your App Store account settings. Privacy Policy: https://hk.wuiyou.com/about/en/privacy.html Terms of Use: https://hk.wuiyou.com/about/en/terms.html

Master Clock is a GPS-disciplined navigation instrument for iPhone, designed for anyone who needs accurate time and position in the field — at sea, in the mountains, or anywhere off the beaten track. ACCURATE TIME The clock is disciplined by GPS satellite time and cross-checked against NTP network time, giving you UTC to within a fraction of a second. The analogue clock face runs at up to 120 Hz for perfectly smooth second-hand motion. NAVIGATION INSTRUMENTS Choose between a full analogue dashboard and a digital readout: • Compass — true heading from the magnetometer, or course over ground from GPS. Smooth, high-refresh needle motion. • Speedometer — speed over ground in knots, km/h, mph or m/s, with a green band marking your planned speed range. • Position — latitude and longitude in degrees/minutes or decimal, with altitude and GPS accuracy. • Sun times — sunrise and sunset for your current position, calculated offline from your coordinates. POSITION LOGGING Start a logging session and Master Clock records your position, speed, course and distance made good at your chosen interval. Sessions run in the background with the screen off, confirmed by an audio beep. Export your log as a CSV file for analysis, passage review, or field records. SPEED ALERTS Set a planned speed range and Master Clock will alert you — with a banner and an audio tone — when your speed falls outside it. Useful for sail trim, tidal planning, or pacing on a long passage. LIVE ACTIVITY A lock-screen Live Activity shows your speed, course and position at a glance while a logging session is active. NIGHT MODE A red-on-black night mode preserves your dark adaptation at sea or under a night sky. Auto mode switches at local sunrise and sunset for your position. GPS INTEGRITY MONITORING Master Clock watches for signs of GPS interference: NTP time drift, location freeze, and physically impossible position jumps. It distinguishes the common benign cases — indoors, tunnels, re-acquisition after a ridge — from genuine anomalies that warrant a position cross-check. PRIVACY Your location data never leaves your device. Log files are excluded from iCloud backup. No account, no subscription, no analytics.