Because it is collected informally. A supervisor notes hours on paper or by message, someone types them up, and payroll runs on a version nobody can verify.
Certifications are worse — the record of who is qualified for what sits in a folder, and the first anyone knows about an expiry is when an inspector asks.
Check-in and check-out happen on site, geofenced where you set it, against the shift pattern for that job. Regularisation handles the genuine exceptions with a reason and an approver.
Certifications live on the personnel record with expiry dates, so a lapse is visible weeks ahead rather than on the day.
It will not track people beyond their shift. Location is captured at check-in and check-out where you enable it, not continuously.
It also will not verify a certificate is genuine.
Payroll runs from approved attendance rather than a transcription, so the disputes drop.
Compliance becomes checkable: who was qualified, on what date, with the certificate attached.
Capture works offline and syncs when reconnected.
Yes, per site and per crew.
Yes, by how far ahead you want them.
Half an hour on your own numbers is usually enough to say whether Nest is the right place to start.