# Grid Locator Calculator > Amateur Radio grid locator calculator for iPhone using GPS, works offline. (iPhone/iPad app by Kazunori Watanabe.) - Source: https://appshunter.io/ios/app/grid-locator-calculator/id714086890 (this page in markdown: same URL + `.md`) - Developer: [Kazunori Watanabe](https://appshunter.io/developer/709465263) - Category: Lifestyle, Reference - Price: Free - Age rating: 4+ - Requires: iOS 10.0 · 22 MB - Languages: American English, Japanese - Released: 2013-09-30 - Data updated: 2026-06-11 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/grid-locator-calculator/id714086890/reviews.md ## What is Grid Locator Calculator? For Amateur Radio operators who often travel to unknown places. Forgot to check GL reference? Do not worry. If you have iPhone and GPS is working then you can check your location's GL reference very easily. You do not need internet connection. Ideal if you go to mobile or portable operation often and not sure where GL boundaries are. App shows you 10 digit locator. If you need only 4 or 6 digit, just use first 4 digit or 6 digit, respectively. Note: Usually Grid Locator is 6 digit as defined in ARRL document. This 10 digit is expansion of 6 digit as 7th and 8th are divided by 10 ("0" through "9") then 9th and 10th are divided by 24 ("a" through "x"). This logic is based on article on Wikipedia. ## Key features - Calculates 10-digit grid locators - Uses iPhone GPS - Offline functionality - Supports 4, 6, and 10-digit locators - Ideal for portable operations ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/grid-locator-calculator/id714086890/reviews.md ### 5/5 — GREAT ! *2013-10-01* I LOVE IT ! ## Frequently asked questions about Grid Locator Calculator ### What is the Grid Locator Calculator used for? Grid Locator Calculator is used by Amateur Radio operators to determine their Maidenhead Grid Locator reference based on their current GPS location. This is particularly useful for portable operations where checking grid boundaries might be difficult. ### Does Grid Locator Calculator require an internet connection? No, Grid Locator Calculator does not require an internet connection to function. It utilizes your iPhone's GPS to calculate the grid locator, making it ideal for use in remote areas. ### What grid locator formats does Grid Locator Calculator provide? Grid Locator Calculator provides a 10-digit grid locator. You can easily use the first 4 or 6 digits if you require those formats, which are commonly used in Amateur Radio. ### What devices is Grid Locator Calculator compatible with? Grid Locator Calculator is compatible with iPhone and iPod devices. It requires a working GPS on your iPhone to calculate the location. ### How often is Grid Locator Calculator updated? The latest version of Grid Locator Calculator is 4.0, which was last updated on June 17, 2020. It was initially released on September 30, 2013. ### What is the age rating for Grid Locator Calculator? Grid Locator Calculator has an age rating of 4+. This indicates it is suitable for users of all ages and does not contain mature content. ### Does Grid Locator Calculator have ads? No, Grid Locator Calculator is ad-free. As it is a free application, it does not display advertisements to users. ### Can Grid Locator Calculator be used for 4-digit or 6-digit locators? Yes, while Grid Locator Calculator provides a 10-digit locator, you can simply use the first 4 or 6 digits of the output for those respective formats. This offers flexibility for different operational needs. ## Version history (last 5 releases) ### 4.0 — 2020-06-17 Thanks for using this app. There are several performance improvement as well as design change. Wish you enjoy app! ### 3.1 — 2017-07-27 Bug fix. In some location, last digit of calculated Grid Locator (5th latitude) was wrong. Thanks for using app. As usual, any feedback is welcome, send to mj0cfw@gmail.com ### 3.0 — 2017-07-25 App shows 10 digit Grid Locator. Note: Usually Grid Locator is 6 digit as defined in ARRL document. This 10 digit is expansion of 6 digit as 7th and 8th are divided by 10 ("0" through "9") then 9th and 10th are divided by 24 ("a" through "x"). This logic is based on article on Wikipedia. As usual, any feedback is welcome, send it to mj0cfw@gmail.com ### 2.3 — 2016-07-07 Made performance improvement. As usual, any user feedback is welcome at mj0cfw@gmail.com ### 2.2 — 2016-03-30 Bug fix - in some cases app crashes because failed to fetch address information from internet. ## Apps similar to Grid Locator Calculator | App | Rating | Price | Category | | --- | --- | --- | --- | | [Boca Grande Club](https://appshunter.io/ios/app/boca-grande-club/id6738577372) | — | Free | Lifestyle | | [Packet Pad](https://appshunter.io/ios/app/packet-pad/id385609173) | 3.8 (16) | $2.99 | Lifestyle | | [RUMlogNG2Go](https://appshunter.io/ios/app/rumlogng2go/id1005575164) | 4.7 (247) | $4.99 | Lifestyle | | [One Day Confession](https://appshunter.io/ios/app/one-day-confession/id6612038754) | — | Free | Lifestyle | | [SOTAMĀT SOTA / POTA Spotting](https://appshunter.io/ios/app/sotamat-sota-pota-spotting/id1625530954) | 4.7 (15) | Free | Lifestyle | | [Morse Maven](https://appshunter.io/ios/app/morse-maven/id6746571072) | 4.5 (6) | Free | Lifestyle | ## More apps by Kazunori Watanabe - [Contest Log Visualizer](https://appshunter.io/ios/app/contest-log-visualizer/id709465260) - [3830 Viewer](https://appshunter.io/ios/app/3830-viewer/id719610093) - [Grid Locator Finder](https://appshunter.io/ios/app/grid-locator-finder/id778569654) - [Contest Race Board](https://appshunter.io/ios/app/contest-race-board/id914019545) - [GLookUp](https://appshunter.io/ios/app/glookup/id992189796) All apps by Kazunori Watanabe: https://appshunter.io/developer/709465263 ## Related topics [kazunori watanabe](https://appshunter.io/ios/topics/kazunori-watanabe) --- *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 2026-06-11.*