# Signal Flags > Reference guide for international and military signal flag identification and interpretation. (iPhone/iPad app by Gigs, Inc..) - Source: https://appshunter.io/ios/app/signal-flags/id355677480 (this page in markdown: same URL + `.md`) - Developer: [Gigs, Inc.](https://appshunter.io/developer/355677483) - Category: Reference, Education - Price: $4.99 - Age rating: 4+ - Requires: iOS 14.0 · 70 MB - Languages: English - Released: 2010-02-18 - Data updated: 2026-06-10 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/signal-flags/id355677480/reviews.md ## What is Signal Flags? Signal Flags is an authority for identification, interpretation and use of signal flags between ships. This comprehensive app is your resource for signal flag information as specified by the International Code of Signals, the U.S. Navy, the International Sailing Federation, NATO, and Allied Forces around the world. Everything you need to know or want to know is in here. “I am a blue water sailor, cruising the East Coast of the U.S. and out to Bermuda. This app [contains] a copy of H.O. Pub 102 which is carried on the signal bridge of every commercial ship in the world. As the code meanings are uniform regardless of the nationality of the ship involved, a Portugese fisherman can use the code to request medical advice from the doctor onboard a Norwegian cruise ship even though neither speaks the other's language. Naturally, the paper copy is easier to use, but this is great in a pinch, and is a good study tool...” - GHK3 It's a beautiful day as you cruise the harbor in your new boat. The smell of sea water and being captain of your own vessel is pretty heady. Taking in the view, you notice a Naval ship flying unusual flags in the area you’re heading for. There’s an “A” flag, followed by a number 3 flag. You know that seafaring vessels have special signals but you don’t know what they mean. Whipping out your Signal Flags app, you quickly scroll, tapping the appropriate flags to discover that you must avoid the ship within 300 yards as they have divers in the water. You adjust your course a little to comply. Thank goodness you were able to find out before you intruded on the ship’s operation. Signal Flags have been used for communication between ships at sea since ancient times. They have evolved throughout history and now are uniformly mandated by the International Code of Signals. The flags remove the language barrier by indicating with symbols, many types of distress and information to all U.S. and Allied Forces around the globe. They are used by government, military and civilians traveling the world’s waterways. The app contains all of the images, flags and pennants that you’ll need to know, along with detailed descriptions of their usage and meanings in international, military, and sail racing contexts. You don’t need a cumbersome book; you don’t even need an internet connection. Just pull out your iPhone, iPad, or iPod Touch and open Signal Flags. All the important information is contained right there in the application. Within a few seconds, you’ll know what that ship is telling you. In addition to the signal details, this app supplies you with the complete documentation of the NIMA pub. 102 and the U.S. Department of Transportation/U.S. Coast Guard Navigation Rules (COMDTINST M16672.2D). Both documents include extensive in-document hyperlinks for accessibility along with a specialized toolbar for quick and simple browsing. A specialized quiz function is also provided to aid in memorization of the entire flag set. 
Features: * Designed and developed by a U.S. Naval Academy graduate * Needs no network connection once downloaded * Contains all current signal flag details * Contains complete documentation as laid out by governing sources * Includes a quiz function to help you memorize all the flags If you spend time on the open water, are the employee of an organization that navigates the seas, a yacht racer, or an interested student, this application is an indispensable tool. Everything is here for you, at your fingertips, anytime, anywhere. Download Signal Flags now. ## Key features - Signal flag identification - Interpretation of flag meanings - International Code of Signals - U.S. Navy and NATO standards - Offline access - Quiz function for memorization ## Recent user reviews (7 of 7) All indexed reviews: https://appshunter.io/ios/app/signal-flags/id355677480/reviews.md ### 1/5 — Keeps crashing *2015-09-24* Crashes after opening more than 2 flags! ### 4/5 — UPDATE: Limited Usefulness *2013-07-25* No search and no internal navigation when opened in LANDSCAPE view. Otherwise, an excellent reference! ### 2/5 — Poor program *2013-03-13* Quite simply some of the tabs on the program don't do anything it remains in the same mode regardless of the setting, there is no sign of a quiz mode either which is what I needed it for. If your just after some information of the flags then its fine, but it should do what it says on the tin! Misrepresentation, poor do for that money. ### 5/5 — Great update! *2011-08-02* I reviewed this app as excellent in the last version, now it's even better, especially on iPad, with new quiz preferences and additional Sail Racing docs. A very handy reference, and great update! ### 5/5 — Complete reference on the flags *2010-07-28* Excellent app, very complete information on the flags, including details of how each flag is used internationally, in sail racing, and by Navy vessels. Great tool for learning and reference. ### 5/5 — Useful reference on iPad and iPhone *2010-07-13* I'm an ex-Navy sailor, and like this app for its complete coverage of the flags and their usage as well as inclusion of both International Code and Nav Rules documents. I use the app both on my iPad, where the docs are excellent to view, and on my new iPhone 4, which keeps my place in docs or quiz between uses. Well done! ### 2/5 — Giant pdf *2010-05-30* This basically is two giant pdf's. One is for the International Codes, which is 157 pages long, and the second is for the Navigation Rules, which is 227 pages long. While these are official National Imagery and Mapping Agency and US Coast Guard publications, there is no way to select a section, you have to go page by page to find anything. Pretty weak effort for the iPad, hopefully this will be improved. ## Frequently asked questions about Signal Flags ### What is Signal Flags? Signal Flags is a reference application that provides comprehensive information on identifying, interpreting, and using signal flags as specified by international maritime codes and military standards. It includes detailed descriptions of flag meanings and usage in various contexts. ### Does Signal Flags work offline? Yes, Signal Flags is designed to work offline. All the necessary information, including flag images, meanings, and usage details, is contained within the application, so you do not need an internet connection to use it. ### What maritime codes does Signal Flags cover? Signal Flags covers standards specified by the International Code of Signals, the U.S. Navy, the International Sailing Federation, NATO, and Allied Forces. It also includes documentation from NIMA pub. 102 and U.S. Coast Guard Navigation Rules. ### Is Signal Flags suitable for beginners? Yes, Signal Flags is a good study tool for beginners and experienced users alike. It provides clear explanations and a quiz function to aid in memorization, making it accessible for those learning about signal flags. ### What devices is Signal Flags available on? Signal Flags is available on iPhone, iPad, and iPod Touch devices. It is designed to be accessible on Apple's mobile operating system. ### How often is Signal Flags updated? The latest version of Signal Flags is 4.2, which was last updated on October 4, 2021. While updates may not be frequent, the core information provided is based on established maritime codes. ### What is the price of Signal Flags? Signal Flags is a paid application priced at $4.99. This one-time purchase grants you access to all the features and information within the app. ### Does Signal Flags have ads? No, Signal Flags does not contain advertisements. As a paid application, it offers an ad-free experience for users. ## Version history (last 5 releases) ### 4.2 — 2021-10-04 Updated for iOS 15 ### 4.1.1 — 2020-10-06 • iOS 14 functionality • Enhanced Quiz UI • Bug fix for quiz ### 4.1 — 2020-09-09 • Bug fixes for background • Support for both landscape orientations on iPad • Added USCG Nav. Aids and MTP-1(D) documents to iPhone functionality ### 4.0 — 2020-08-14 Revised UI and functionality for iOS 13.5 • Dark Mode support ª All documents searchable • configurable quiz timer iPad-specific changes and additions: • sidebar view with interactive in-document navigation using Table of Contents and/or thumbnail views * inclusion of the complete MTP 1(D), Volume II, Multinational Maritime Tactical Signal And Maneuvering Book • Revised U.S. Coast Guard Navigation Aids booklet * Support for Portrait & landscape orientations ### 3.0 — 2019-07-03 • Revised User Interface and program code to support iOS 12 and all current iPhone and iPad devices • Added flag usage content from MTP 1(D) Volume II Multinational Maritime Tactical Signal and Maneuvering Book, as updated by Change 1 on 10/18/ 2004 ## Apps similar to Signal Flags | App | Rating | Price | Category | | --- | --- | --- | --- | | [Birds of Patagonia](https://appshunter.io/ios/app/birds-of-patagonia/id835863677) | 1.5 (4) | $3.99 | Reference | | [ICS Academy: Nautical signals](https://appshunter.io/ios/app/ics-academy-nautical-signals/id1504127465) | 5.0 (1) | Free | Reference | | [International Certificate of Competence (ICC)](https://appshunter.io/ios/app/international-certificate-of-competence-icc/id974073756) | 2.7 (3) | $4.99 | Reference | | [Bird Call Xeno - Bird Songs](https://appshunter.io/ios/app/bird-call-xeno-bird-songs/id1293689572) | 3.5 (2) | Free | Reference | | [Navigation Rules Pro](https://appshunter.io/ios/app/navigation-rules-pro/id494309072) | 4.8 (433) | $4.99 | Reference | | [First Aid at Sea - Adlard Coles](https://appshunter.io/ios/app/first-aid-at-sea-adlard-coles/id977696192) | — | $4.99 | Reference | ## More apps by Gigs, Inc. - [Signal Flags International](https://appshunter.io/ios/app/signal-flags-international/id358894266) - [Signal Flags Info](https://appshunter.io/ios/app/signal-flags-info/id359067232) - [Sleep Monitor](https://appshunter.io/ios/app/sleep-monitor/id516856134) - [Signal Flags Communicator](https://appshunter.io/ios/app/signal-flags-communicator/id911267963) All apps by Gigs, Inc.: https://appshunter.io/developer/355677483 --- *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 2026-06-10.*