# Tanker - The Sounding App — Sounding Tables In Your Pocket > Marine fuel tank volume calculator for instant readings and stability management. (iPhone/iPad app by Pearson Smith.) - Source: https://appshunter.io/ios/app/tanker-the-sounding-app/id1442173028 (this page in markdown: same URL + `.md`) - Developer: [Pearson Smith](https://appshunter.io/developer/1268483172) - Category: Utilities, Reference - Price: Free with in-app purchases - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 26.1 · 14 MB - Languages: American English, Arabic, Danish, Dutch, French (France), German (Germany), Greek, Indonesian, Italian, Japanese and 9 more - Released: 2020-01-24 - Data updated: 2026-06-22 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/tanker-the-sounding-app/id1442173028/reviews.md ## What is Tanker? Tanker - Marine Fuel Tank Calculator Stop thumbing through dirty sounding table binders. Get instant tank volumes. Every chief engineer knows the routine: sound the tanks, walk back to the control room, dig out the crusty binder, flip through pages for each tank, look up trim corrections, punch numbers into a calculator. Tanker cuts this 20-minute process down to 2 minutes. The Old Way vs. The Tanker Way Old: Drop tape → Record height → Walk to control room → Find binder → Flip pages → Look up trim → Find volume → Repeat for each tank → Add on calculator Tanker: Drop tape → Tap tank → Enter sounding → Get instant volume → Done How It Works Build your vessel's sounding tables once using CSV import, the Express Editor, or by duplicating similar tanks. Select your vessel, tap a tank, enter your sounding—instant volume lookup with trim automatically applied. Sound all your tanks, hit the equals button, get your total. Features That Save Time - Instant Volume Lookups - No more flipping through binder pages - Target Fill Levels - Set specific fill preferences per tank to maintain vessel stability - Multiple Build Methods - CSV import, Express Editor, tank duplication - Smart Tools Built In - Unit conversion, safe fill percentages, sounding history with trends - Bunkering Mode - Track fuel transfers in real-time with target level warnings - Works Offline - All calculations on-device, no internet needed - Share Tables - AirDrop to crew or publish to TankerBase for the whole fleet Maintain Stability During Transfers Set target fill levels for each tank based on your vessel's stability requirements. During bunkering, Tanker warns you when approaching target levels—keeping your vessel balanced without mental math or paper notes. TankerBase: Cloud Sharing Create an account to share your sounding tables online. Share peer-to-peer with your relief engineer or publish your tables to our database for anyone to subscribe to. Build once, share with your entire fleet. Built by Engineers, For Engineers Tanker was created by a chief engineer who got tired of the sounding table binder routine. If you've ever stood in an engine room covered in fuel oil trying to find the right page in a beat-up binder, this app is for you. Download Tanker and leave the binder in the drawer. Subscription Details Yearly Plan: $19.99/year Lifetime Plan: $59.99 (best value) Payment is charged to your Apple Account at confirmation of purchase. Subscriptions automatically renew unless canceled at least 24 hours before renewal. Manage or cancel anytime in your App Store account settings. Subscription Terms: https://www.seasmith.net/tanker-subscription-terms/ Privacy Policy: https://www.seasmith.net/tanker-privacy Terms of Use: https://www.seasmith.net/tanker-terms ## Key features - Instant volume lookups - Target fill level setting - CSV import and tank duplication - Unit conversion and safe fill percentages - Bunkering mode for real-time tracking - Offline functionality - Cloud sharing via TankerBase ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Full Version | $4.99 | one-time | | Tanker Pro Lifetime | $59.99 | one-time | ## Frequently asked questions about Tanker ### How does Tanker calculate fuel volumes? Tanker uses your vessel's sounding tables, which can be imported via CSV or built within the app. Once a tank is selected and the sounding is entered, the app instantly provides the volume, automatically applying trim corrections. ### Can I use Tanker without an internet connection? Yes, Tanker is designed to work offline. All calculations are performed on your device, ensuring you can access its features even when at sea without internet access. ### What are the subscription options for Tanker? Tanker offers a Yearly Plan for $19.99/year and a Lifetime Plan for $59.99. Subscriptions automatically renew unless canceled at least 24 hours before the renewal date. ### How does Tanker help maintain vessel stability? You can set target fill levels for each tank based on your vessel's stability requirements. During bunkering, Tanker provides warnings when approaching these target levels, helping to keep the vessel balanced. ### Can I share my sounding tables with other crew members? Yes, you can share tables directly with crew members via AirDrop or publish them to TankerBase for your entire fleet to subscribe to. This allows for centralized table management. ### What is the age rating for Tanker? Tanker has an age rating of 4+, making it suitable for a wide range of users. The app is available on iPhone and iPad. ### How often is Tanker updated? The latest version of Tanker is 4.0.4, last updated on March 29, 2026. Updates typically include new features, performance improvements, and bug fixes. ### Does Tanker have ads? No, Tanker does not contain advertisements. The app is free to download and offers in-app purchases for its subscription plans. ## Version history (last 5 releases) ### 4.0.4 — 2026-03-29 Bug Fixes - Ships and Tanks weren’t duplicating properly when making copies in Editor. ### 4.0.3 — 2026-03-25 Products now sort by last sounded rather than alphabetical. ### 4.0.2 — 2026-03-15 Fixed Bunker Mode data retention. If the user were to go into other apps, the memory would clear for Bunker Mode and would disappear from sounder view. ### 4.0.1 — 2026-03-05 Sign in with Apple added as an option when creating a TankerBase account. TankerBase Account Deletion Added in Settings Subscription Terms of Use and Privacy Policy added to bottom of purchases view. Bug Fixes ### 4.0 — 2026-02-16 Say hello to the next generation of Tanker! Tanker 4 is the ultimate sounding app on iOS! New Features - TankerBase: An online database for vessel sounding data. Optionally create your own free TankerBase account and download, backup, or publish vessels in the cloud. You can also share your vessels peer-to-peer with other TankerBase users or just kick it old school and continue to AirDrop your sounding tables. Ultimately, we do not collect any "live" data from users to ensure privacy of assets from an operational standpoint. You will need to agree to our new Terms of Use and Privacy Policy before creating an account. - More Metadata: Ships have more metadata points so that users can find their favorites in TankerBase. - Localizations: This is a maritime app so thanks to ai, we translated to over 15 languages. - Improved UI: We experimented with Liquid Glass and we think we've found the perfect balance. UI is more compact. - Improved Bunkering: Bunkering just wasn't where it needs to be and so the counter UI has been fixed and timing calculations. You can now offload bunkers and get notifications when you've reached 90% of your order or 100%. Bug Fixes - Particularly, when adding or editing the sheet doesn't close on you the first time. ## Apps similar to Tanker | App | Rating | Price | Category | | --- | --- | --- | --- | | [MMS - Bunker Fuel Calculator](https://appshunter.io/ios/app/mms-bunker-fuel-calculator/id6456887650) | 5.0 (2) | Free | Utilities | | [ENGINE SFC](https://appshunter.io/ios/app/engine-sfc/id6469806252) | — | Free | Utilities | | [Interpolator](https://appshunter.io/ios/app/interpolator/id635235982) | 4.9 (65) | Free | Utilities | | [Citizen Sea](https://appshunter.io/ios/app/citizen-sea/id6473001342) | 5.0 (1) | Free | Utilities | | [CargoSurveyor Tools](https://appshunter.io/ios/app/cargosurveyor-tools/id932816645) | 3.5 (2) | $11.99 | Utilities | | [NavalToolbox - Architecture](https://appshunter.io/ios/app/navaltoolbox-architecture/id1571366517) | — | Free | Utilities | ## More apps by Pearson Smith - [iBTHO](https://appshunter.io/ios/app/ibtho/id1268483173) - [Maritime Stickers](https://appshunter.io/ios/app/maritime-stickers/id1446951221) - [HNAV](https://appshunter.io/ios/app/hnav/id1503064750) - [Bike Rack](https://appshunter.io/ios/app/bike-rack/id1521264145) - [License to Sail](https://appshunter.io/ios/app/license-to-sail/id1605521074) All apps by Pearson Smith: https://appshunter.io/developer/1268483172 --- *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 2026-06-22.*