This app was mentioned in 1 comment, with an average of 1.00 upvote
I downloaded Tect O Trak yesterday and gave it a quick run-through. I think that for my purposes, it will not be helpful. Seems to be designed more for UK style detecting where they might spend a year or two on one big field. There is an iOS and an Android version. https://play.google.com/store/apps/details?id=com.trib.app.tectotrak&hl=en