It's likely weatherproof paper and a grease pencil. We deal with EMS agencies and modern technology is often useless for them in harsh weather. Screens can be difficult to read outdoors and any touch devices are unresponsive in a downpour or very cold weather. Not to mention they often have blood on their hands so contamination is also an issue with any tech. I'm sure the greasy filth of an oil rig doesn't play well with most tech either.