Why record gas readings as numbers rather than a pass/fail?
Because the numbers are the evidence. An oxygen reading of 20.9% and one of 19.1% are both technically 'tested', but only one of them is a normal atmosphere. Storing the values means a reading that was borderline is still visible later, which matters if anything is ever investigated.
Does this replace a confined space rescue plan?
No. The permit records the hazards, controls, PPE and authorisation for a specific entry. Your rescue arrangements and trained rescue team still have to exist — the permit is where you record that they were in place before entry.
Can the permit be completed offline?
Yes. Confined spaces are exactly where signal disappears. The field app captures the permit and readings on the device and syncs when you are back in coverage.
Who can authorise a permit?
The permit records an authorising person against it. Combined with Gaffer's role permissions and qualification gates, you can keep permit authorisation with the people who are actually competent to give it.