Free

Details

  • Released
  • Updated
  • March 11, 2015
  • October 31, 2025

Features

Shellback screenshot #1 for iPhone
Shellback screenshot #2 for iPhone
Shellback screenshot #3 for iPhone
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About

This app provides US Naval Surface Force personnel with offline access to essential information. It includes manuals and resources for administration, medical, operations, personnel management, safety, and navigation rules. Content is updated annually for relevance.

βœ“Offline access to SURFOR information
βœ“Admin/Training manuals
βœ“Medical readiness resources
βœ“Operations and navigation training
βœ“Personnel management documents
βœ“Safety information and lessons learned
βœ“Rules of the Road quiz
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What's New in Shellback

2.3

October 31, 2025

-- Bug fixes and stability updates

User reviews

Not so great

This app is out of date! Why does the navy not put the time in to the products to ensure members have the most recent instructions? Also, why not add more things to this app?

Poor maintenance of instructions and references

Updates to the references and instructions are not the latest. Do better.

Not useful for ROR practice

The ROR practice quiz should be a great feature. However, if you get a question wrong there is zero explanation/indication of what the correct answer is…and therefore zero opportunity to learn. Disappointingly limited.

Love this app!

I love this app I just wish you could be told what the correct answer is on the ROR quiz after you answer the wrong one.

Rules of the Road and Feedback need improvement

The Rules of the Road quiz portion is a valuable tool to work on skills, but should be updated to show what the correct answer should have been when you get one wrong. On the iPhone 13pro, the app crashes when I try to put my name in the feedback bar, preventing me from actually giving this feedback as actual feedback.
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Developer apps

FAQ

What is the Shellback app?

Shellback is a free mobile application designed to support US Naval Surface Force (SURFOR) personnel by providing easy-to-access offline information. It was formerly known as eDivo.

What kind of information is available in the Shellback app?

The app contains information categorized into Admin/Training, Medical, Operations, Personnel Management, Safety, and Rules of the Road. This includes various manuals, readiness resources, operating procedures, policy documents, and safety lessons learned.

Is the Shellback app free to use?

Yes, the Shellback app is completely free to use. It does not have any in-app purchases or advertisements.

Can I use the Shellback app without an internet connection?

Yes, a primary feature of the Shellback app is its ability to provide offline access to key SURFOR information. This allows Sailors to access necessary resources while underway, even without an internet connection.

How often is the information in the Shellback app updated?

The content within the Shellback app is scheduled for annual updates. This ensures that SURFOR Sailors have access to the most relevant and current information available.