This document provides an overview of the ProMark 800 GNSS sensor. Key features include support for multiple satellite constellations and frequencies through 120 tracking channels and Z-Blade technology. It has sub-meter real-time precision and centimeter-level post-processed precision. The ProMark 800 has a rugged design, long battery life, and built-in cellular and radio modules for connectivity. It is a high-precision GNSS solution for demanding surveying applications.