Bosun's Mate

Close out your season with clean logs: edit or delete any entry, fuel stats recalculate instantly, and safety gear expiry alerts keep you USCG-ready for spring.

Bosun's Mate is the vessel management system every mariner wishes they had.

Engine hours. Fuel logs. Parts catalogs. Receipts. Cruising notes. Everything that matters about your boat — captured beautifully, totalled automatically. Searchable. Cross-linked. Never lost.

WHY CAPTAINS LOVE IT

— Multi-engine support for twin and quad rigs. Track port, starboard, and beyond — each engine logged independently with its own service intervals, fuel economy, and hours.

— AI receipt OCR. Snap a photo of a parts receipt and Bosun's Mate reads every line item in 8 seconds. Vendor, OEM numbers, prices — extracted, organized, and added to your catalog. No more squinting at fading thermal paper.

— Multi-page survey extraction. Drop in a marine survey PDF and the AI pulls engine specs, hull data, electronics, and equipment into your vessel profile automatically. Saves hours of manual entry every time you buy a new boat.

— Per-engine fuel economy. See exactly which engine is burning more fuel at any RPM. Charts compare engines side-by-side at every cruise speed. Spot a lazy engine before it costs you thousands in repairs.

— Cruising log with photos. Document every trip with notes, weather, distance, and on-the-water photography. Build a permanent record of your adventures.

— Cost tracking that actually balances. Every receipt is logged with category, vendor, and date. Year-to-date costs always one tap away.

— Activity feed. Chronological view of every change — yours and your crew's. Like git history, but for your boat.

— Co-Captain shared access. Invite your spouse, captain, or trusted crew with read-only or full-edit permissions. Everyone looking at the same data.

— Offline-capable. Works on the water with no signal. Syncs the moment you're back at the dock.

— Photo attachments on every entry. Document parts, damage, repairs visually.

WHAT YOU CAN TRACK

— Maintenance (oil changes, service intervals, anode replacement) — Fuel purchases and fuel-economy data points — Parts catalogs (with OEM and aftermarket numbers, grouped by manufacturer) — Zincs and consumables with replacement schedules — Surveys, manuals, and reference documents — Cruising logs with destinations, distances, and photos — Custom categories you define yourself

PRIVACY FIRST

Sign in with Apple or email — your choice. We never sell your data, never track you across other apps, and never share with advertisers. Account deletion is one tap in Settings — your data is permanently removed within minutes.

SUBSCRIPTIONS

Bosun's Mate is free to download with a 7-day free trial of all features. After the trial, continue with an auto-renewable subscription:

— Bosun's Mate Pro Monthly — 1-month auto-renewing subscription — Bosun's Mate Pro Annual — 1-year auto-renewing subscription

Payment is charged to your Apple ID at confirmation of purchase. Your subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. Manage or cancel anytime in your Apple ID Account Settings > Subscriptions.

Terms of Use (EULA): https://bosunsmate.app/terms Privacy Policy: https://bosunsmate.app/privacy

Built by mariners. For mariners.