I have a Lowrance 334C iGPS and made some great maps last summer. This spring, I added some new sonar logs and now the exported AT5 files aren't working on my gps. If I put last years on the chip, they work great.

Did the update I installed this spring change a setting for the AT5 maps?

I uninstalled version 1.8 and installed version 1.6. I then opened my my map project and created a new AT5 and it worked. I then tried upgrading to 1.8 again and the exported AT5 didn't work.

Is there a setting I'm missing in this version that is messing up my AT5 files?

Hi Damdiver,
The default "Atlas version" for AT5 exports is now 12, whereas it used to be 10. Try exporting your map via "Export map to file" (not via a preset style) and setting the version to 10 before export:





Please let me know if this fixes your issue.

That did the trick. Thank you.