How it works
HydroLevel combines corrected GNSS and motion measurement with WatchMan500 processing for water levels and vertical-datum work. RTK or satellite corrections support real-time output; RINEX postprocessing requires correction services. The supplier advertises 1 cm resolution and better-than-10 cm accuracy, while NOAA’s December 2025 specifications give configuration-dependent datum estimates and processing requirements. NOAA records a particular Hydrolevel Mini deployed near Ofu in 2023.
Technical detail
Core features
- GNSS/motion measurement with WatchMan500 processing
- 0.6, 0.9 and 1.8 m variants with configuration-specific power
- Real-time corrections or RINEX postprocessing dependencies