Island Atlas is a Progressive Web App. You can install it for free and use it just like a native app on your home screen.
Tap the Share button in the bottom menu bar of Safari.
Scroll down and tap Add to Home Screen.
Tap Add in the top right. Your tracker is now ready!
Look for the Install icon directly in your address bar.
Icon not there?Tap the Menu button (three dots) in the top right and tap Install App (or "Add to Home screen").