Hi there! I’m sorry to hear that BaseMap crashes immediately when you try to open it on your iPhone. Let’s try to get this sorted out together. To start, could you tell me if this started happening recently or has it been ongoing? Also, have you tried any steps so far like restarting your phone or reinstalling the app?

Meanwhile, here are some general troubleshooting steps we can try on your iPhone with iOS 18.5:

1. Force Close and Reopen the App
- Swipe up from the bottom (or double-click the Home button if you have one) to see your recent apps.
- Swipe the BaseMap app off the screen to close it.
- Then, open BaseMap again to see if it launches correctly.

2. Restart Your iPhone
- Press and hold the side button and either volume button until the power off slider appears.
- Slide to power off, wait 30 seconds, then turn your phone back on.
- Try opening BaseMap again.

3. Check for BaseMap Updates
- Open the App Store and tap your profile icon at the top right.
- Scroll down to see if BaseMap has an update available. If yes, update it and try again.

4. Reinstall the App
- Press and hold the BaseMap app icon until it wiggles, then tap the “X” or “Remove App” option.
- Go to the App Store, download, and reinstall BaseMap.
- Log back in if required and test opening the app.

5. Check iOS Version and Storage
- Make sure your iPhone is running iOS 18.5 as you mentioned (Settings > General > Software Update).
- Also check that you have enough free storage (Settings > General > iPhone Storage), as lack of space can sometimes cause app crashes.

If the app still crashes after these steps, there could be an issue with cached data or a conflict with other apps/settings. Let me know if you have tried any of these or if you notice any error messages.

We can also dive into more advanced troubleshooting if needed, or I can help escalate this to BaseMap’s support team for deeper inspection. How are we looking so far?