Tanker - The Sounding App

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