Modern apps like Theodolite (iOS) offer professional-grade capabilities:

: Built-in maps allow for marking waypoints, calculating distances/headings between markers, and even tracking sun, moon, and planet positions in AR.

The app functions as a multi-tool for field data collection, combining several instruments into a single interface:

While not a replacement for high-precision Total Stations on major construction sites, these apps are essential for: Theodolite User Manual - Hunter Research & Technology