Mm
Mm
Have you changed the units to metric? https://www8.garmin.com/manuals/webhelp/GUID-3A791586-B59F-4B37-B9C5-5A41F8C6BE0B/IT-IT/GUID-F53E6A73-0AA3-477B-BC6E-B0ECD2CE92D8.html
After that you might have to change the auto lap distance to 1 km from 1.61 km. https://www8.garmin.com/manuals/webhelp/GUID-3A791586-B59F-4B37-B9C5-5A41F8C6BE0B/IT-IT/GUID-BB3433F8-FC49-4B0B-865C-A087655414B5.html