# Deckhand! — Predictive Boat Maintenance > Predictive boat engine maintenance and diagnostics from MFD data. (iPhone/iPad app by Elias Alamat.) - Source: https://appshunter.io/ios/app/deckhand/id6769489538 (this page in markdown: same URL + `.md`) - Developer: [Elias Alamat](https://appshunter.io/developer/1787607522) - Category: Utilities, Lifestyle - Price: Free with in-app purchases - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 15.1 · 67 MB - Languages: American English - Released: 2026-07-26 - Data updated: 2026-08-19 - Monetization: freemium - User reviews in markdown: https://appshunter.io/ios/app/deckhand/id6769489538/reviews.md ## What is Deckhand!? The check-engine light your boat never had. Deckhand reads the engine data already flowing through your Simrad, Lowrance, or B&G display — RPM, coolant temp, oil pressure, voltage, fuel rate — and turns it into predictive maintenance intelligence a boat owner can actually use. Every trip logs itself the moment your engine cranks. Every reading gets analyzed against how your specific engine should behave. Wear that would never show up on a gauge — coolant creeping up 0.2° per trip, oil pressure sagging at cruise, alternator dropping under load — becomes visible before it becomes a problem. WHAT YOU GET • Live engine dashboard from your MFD — RPM, coolant temp, coolant pressure, oil pressure, battery voltage, fuel rate, gear position • Automatic trip logging — trips start and end themselves based on engine RPM • GPS route recording on the trip map • Engine hours tracked to the second, per engine • Maintenance log that stays with the boat • Adaptive service intervals — impeller / oil / anodes tuned to how you actually run, saltwater vs freshwater • Alerts when a reading crosses a real threshold, not an arbitrary number DECKHAND PRO Unlock the predictive intelligence: • Failure-mode detection — catches impeller wear, thermostat drift, and alternator sag as they develop • Predictive Health Engine — trend slopes, wear factor, cruise-band analysis • Engine Diagnostics — RPM distribution, health trends, oil-vs-RPM correlation • Unlimited trip history — every voyage preserved, charted, searchable • Resale PDF report — the Carfax equivalent for your hull • Adaptive alerts — service reminders that know how hard you actually run the engine $9.99/month or $59.99/year. Cancel anytime. Free tier includes the live dashboard, your 5 most recent trips, and basic alerts. WORKS WITH Deckhand connects to Navico-family multifunction displays (Simrad, Lowrance, B&G) built from 2015 forward, using the GoFree Tier 2 protocol over WiFi. No adapters, no dongles — just your phone and your MFD on the same network. Works with Mercury and Yamaha engines routed through a compatible display. WHY DECKHAND Boat engines don't have check-engine lights. They have gauges you glance at, sensors that fail silently, and a service schedule that assumes you run at 3200 RPM in freshwater. Deckhand replaces that with real data — from your actual engine, in your actual water, at your actual throttle — and turns it into intelligence you can act on before something breaks. Built by a boat owner. Made in San Diego. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ ## Key features - Live engine dashboard - Automatic trip logging - GPS route recording - Engine hour tracking - Maintenance log - Adaptive service intervals - Failure-mode detection ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Deckhand Pro — Monthly | $9.99 | per month | | Deckhand Pro | $59.99 | per year | ## Frequently asked questions about Deckhand! ### What boat engines does Deckhand! work with? Deckhand! works with Mercury and Yamaha engines that are routed through a compatible Navico-family multifunction display (Simrad, Lowrance, B&G) built from 2015 forward. It connects via WiFi using the GoFree Tier 2 protocol. ### What features are included in the free version of Deckhand!? The free tier of Deckhand! provides a live engine dashboard, access to your 5 most recent trips, and basic alerts. This allows users to monitor key engine parameters and get immediate notifications for critical issues. ### How does Deckhand! Pro enhance predictive maintenance? Deckhand! Pro unlocks advanced features like failure-mode detection for issues like impeller wear and alternator sag, a Predictive Health Engine for trend analysis, and detailed engine diagnostics. It also offers unlimited trip history and a resale PDF report. ### What is the subscription cost for Deckhand! Pro? Deckhand! Pro is available through a subscription model. Users can choose between a monthly plan for $9.99 or an annual plan for $59.99. Subscriptions can be canceled at any time. ### How often is Deckhand! updated? Deckhand! was last updated on July 26, 2026, with version 1.0. While specific update frequency isn't detailed, the app was released on the same date, indicating it is a relatively new application. ### Is Deckhand! suitable for all boaters? Deckhand! is specifically designed for boat owners who have compatible Navico-family displays and engines. It's most beneficial for those who want to move beyond basic gauge monitoring to proactive, data-driven engine health management. ### Does Deckhand! have ads? No, Deckhand! does not contain advertisements. As indicated by the data, the 'hasAds' flag is false, meaning users can enjoy the application without any ad interruptions. ### What is the age rating for Deckhand!? Deckhand! has an age rating of 4+. This indicates that the content is generally suitable for all ages, with no mature themes or potentially objectionable material. ## Version history (last 1 release) ### 1.0 — 2026-07-26 No release notes. --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-19.*