Hi there! I understand you're not seeing contour lines in your onX Fish app on your iPhone with iOS 18.7. Let's get to the bottom of this together.

To help me support you better, could you tell me:
- Are you viewing a specific lake or body of water where you expect contour lines?
- Have you enabled any map layers or settings related to contours?
- Are you using the app online or in offline mode?
- Have you noticed this on all lakes or just certain ones?

Meanwhile, here are some steps to check and potentially fix the contour lines issue:

1. Check Map Layers:
In onX Fish, contour lines are often part of specific map layers which might need to be enabled. Open the app, go to the map view, and look for a layers or settings icon. Make sure "Depth Contours" or similar layers are turned on.

2. Zoom Level:
Contour lines may only appear at certain zoom levels. Try zooming in closer on the lake; sometimes these lines don't show up when zoomed out.

3. Update the App:
Ensure your onX Fish app is updated to the latest version from the App Store. Updates can fix map data display issues.

4. Internet Connection:
If you're viewing maps online, a stable internet connection is needed to load detailed contour data properly.

5. Offline Maps:
If using offline maps, ensure you have downloaded the lake's maps fully, including contour data.

6. Region Data Availability:
Contour data depends on state DNR or local sources; some areas have more detailed contours than others. If your location has limited contour data, lines may not show well or at all.

If you’ve already tried these or the issue persists, let me know! We can then explore more advanced troubleshooting or verify if there’s a known data limitation for your area.

Looking forward to your details so I can assist further!

No contour lines in onx fish app