Minimum crewing is a role question before it is a numbers question. 
compares the people actually available on a shift against the positions and competencies that shift is required to field.
Most crewing shortfalls are not caused by people failing to turn up. They are caused by the wrong mix turning up: the shift is numerically full, but a required role has nobody qualified to hold it, or the one person who can has a lapsed assessment.
Roster software is usually built to fill slots rather than to test capability, so it reports a complete shift. The gap only surfaces when someone senior happens to notice, or when the shift is tested.
Attendance in is captured through a mobile check-in designed for crews in the field. Officers can confirm the crew at the start of a shift, and the system distinguishes who is rostered, who is present and who is operationally available once competencies and authorisations are taken into account.
Location verification, where an organisation enables it, happens at the moment of check-in to confirm the person is at the authorised workplace. It is an event-based check rather than continuous tracking of anyone's location.
The practical output is a short, specific list at the start of a shift: which positions are covered, which are not, and what is missing in each case. That is a conversation that can be resolved — a callout, a reassignment, a temporary restriction on an activity — rather than a number to be explained later.
Over time the same records show where shortfalls cluster, which is usually the strongest argument for where training or recruitment effort should go.
A full shift can still be short of a required role. Coverage in is always measured against the competencies and positions the shift requires.
Where enabled, location is used to verify presence at an authorised workplace at check-in. is not designed as a continuous movement-tracking tool.
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