Foreflight customers using older Apple tablets and phones are being urged to upgrade soon to be able to get the latest versions of the popular flight planning app. The company announced earlier this month that Apple iOS 10.3 will become the minimum operating system requirement for new versions of the mobile app although the existing functions will keep working. “Essential features like chart downloads, documents, and data syncing will continue to work as they do now,” the company said in notice to customers.

The devices likely to be affected include iPad 2, iPad 3, iPad Mini 1 and iPhone 4S. “We’re planning to add many exciting new features to ForeFlight this year, so consider upgrading your iOS devices soon so you’re ready when they arrive,” the company said. It offers an iPad Buying Guide to help customers pick the device that will work best for them.