Fishing is a very old industry. A “revision of a tool already in use”… there is a really good chance that it has been done before and there is a failure you have yet to realize.

Source: my many years on the sea.

Instead of looking for modern solutions to an ancient problem, use the ancient solution and pay the clock. Employee forgets to clock in? Pay them from the time they clock in. Employee forgets to clock out? Pay their scheduled end. As the employer you should have an accurate record for overtime requests and the time clock is your official record of when an employee starts work. There are no arguments or circumstances where an employee can claim unrecorded time unless the timeclock itself is broken. You are required to compensate employees for all time worked. You track this with your clock. Employees who “forget” are volunteering their time. All employees should have signed a “timeclock” policy.