Beach litter tracking (not Debris Tracker)

I spend a lot of time picking up beach litter. I started just picking up what I walked past while I was walking my dogs, but now it has become a habit. I've "apopted" a bit of beach near my house and I go there most days to pick up the trash. It occurs to me that there is potentially a scientific benefit to tracking it. Is that true? I studied maths, not science, so I don't really know. I tried looking for apps and came across Debris Tracker, but it requires internet access, which my beach does not have. I live in rural Chile, so when I'm outside of my own home wifi, I can't reliably access the internet. Are there any alternatives which work without needing internet access? Ideally somthing quick and easy, as I usually fill up a bag per day, so I don't want to spend ages filling in an app.