Seafarer Job Wizard

13 offline bridge calculators

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

Built to keep working when the satellite link drops. Squat & UKC, gyro error, deviation, sun sight LOP, great circle and bunkers — all on the device. 30 languages. The calculations a watchkeeping officer actually runs, in one app. Everything is computed on the device, so it keeps working in the middle of an ocean with no link. NAVIGATION CALCULATORS — 13 · Squat & UKC — table method plus height of tide. Load your own company squat table from CSV. · Gyro Error (Sun, stars, planets) — true bearing vs gyro bearing, with a polar star finder over the 57 navigational stars plus Polaris. · Deviation / Variation — the CDMVT chain, with the WMM2025 magnetic model built in. · Amplitude and Rise & Set · Sun Sighting (LOP) — sextant altitude to Ho/Hc to intercept and line of position, with running fix. · Great Circle Sailing — distance, initial course, vertex and latitude at a given longitude. · True Wind, ETA, Bunker Calculation · Tank Calibration (Sounding) — interpolates your calibration table and refuses to extrapolate beyond it. · Watchkeeping Tools — round timer plus a night navigation-light identification quick reference. · Anchor Holding Power — Pro Pack Drag the list into the order you work in, and reset it any time. FILL IN FROM A PHOTO — ON-DEVICE TEXT RECOGNITION Read ship's particulars, deviation cards, sounding tables and observation logs from the camera or your photo library straight into the input fields. Recognition runs entirely on the device and the images are never transmitted. SEAMEN'S CLUB DIRECTORY — OFFLINE 541 clubs across 391 ports in 71 countries. Search services, shuttles and phone numbers with no connection and dial straight from the entry. Favourites, notes and your own added entries stay on the device. SHIP PROFILES Keep particulars, tank calibration tables, deviation cards and your custom squat grid per vessel and recall them on demand. LOGBOOK Squat & UKC calculation history and the gyro observation worksheet are saved on the device and export as text. COMMUNITY — OPTIONAL A document market and board for exchanging material with other officers. Browse and take part without signing in. PRO PACK — ONE-TIME Unlocks the Anchor Holding Power calculator and the offline translator. Not a subscription; once unlocked it keeps working offline. 30 languages. Note — this is a navigation aid for reference only. Verify every result against official nautical publications, ENC/charts and your company's procedures before use. Navigational decisions remain the navigator's responsibility.

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Information

Seller
  • JIWON SEO
Size
  • 122.7 MB
Category
  • Navigation
Compatibility
Requires iOS 15.5 or later.
  • iPhone
    Requires iOS 15.5 or later.
  • iPad
    Requires iPadOS 15.5 or later.
  • iPod touch
    Requires iOS 15.5 or later.
  • Mac
    Requires macOS 12.4 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
  • English and Korean
Age Rating
18+
  • 18+
  • Learn More
  • Contains
    User-Generated Content
    Social Media
In-App Purchases
Yes
  • 500 Points $3.99
  • 1,200 Points $9.99
  • 3,000 Points $19.99
  • Learn More
Copyright
  • © 2026 JIWON SEO
  • Privacy Policy

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