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How to fix map card not detected on Lowrance HOOK Reveal?
Use this guide to diagnose fix map card not detected on a Lowrance HOOK Reveal. Menu labels and features vary by hardware revision and software version; verify the instructions against the manual for your exact device.
Before you begin
- Record your display model, serial number (keep it private), software version and any exact error message.
- Check power, cables and supported accessories before changing settings.
- Back up waypoints, routes and trails if your unit supports data export.
Step-by-step troubleshooting
- Power down and reseat the card. Inspect card contacts and slot for contamination or bent pins. Confirm card format and model compatibility.
- Try a known-compatible card if available. Never erase the original chart card while troubleshooting.
- Restart the unit safely and check whether the issue has been resolved.
- If the issue remains, compare the setup with the official Lowrance installation or operator manual for this model.
Common reasons this happens
Possible causes include an incompatible accessory or chart, outdated device software, incorrect source selection, low voltage, damaged connectors or settings that do not match the installed equipment. Not all features are available on every Lowrance model.
Frequently asked questions
Can I use the same update file on another Lowrance model?
No. Use only firmware specifically identified as compatible with your exact model and hardware version.
Will a factory reset erase my saved waypoints?
It may. Export and verify a backup before performing any destructive reset.
Where should I obtain maps or software?
Use authorized Lowrance and chart-provider resources, and confirm geographic coverage and licensing before installation.
Related help
Browse all Lowrance GPS, sonar and chart guides · Request independent assistance