Hi,
On Garmin Forums: Archived Track and Auto Save Information | GPSMAP® 66i | Garmin Customer Support
Auto Archive and Auto Save Settings
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NOTE: When importing FIT activities or GPX tracks with more than 20,000 track points, the device filters the line to fit in the device memory and improve map drawing performance, while retaining the shape and history of the recording. The FIT and GPX files retain all of their original track points.
Does "line" mean "track?"
