Because resection (free station) is complex. The TCR805 handles it via the onboard “Set Orientation” or “Resection” app. The manual dedicates 10+ pages to it. Without the manual, you risk bad coordinates.
I found several copies of the Leica TCR805 / TPS800-series user manual online (PDFs on Scribd and other manual sites) and support notes (e.g., Carlson Knowledge Base for TC/TC805L). I can: leica tcr805 total station user manual
: The manual details getting started with laser plummets and electronic levels, which replace traditional optical methods for faster setup. Because resection (free station) is complex