While the 2018 version is an older release, you can still find official support and documentation through these channels: HYPACK® User Manual | Xylem
How to deliver data to clients (USACE, NOAA, local port authorities). hypack 2018 manual
Do not search for "HYPACK 2018 manual crack" or use keygens. These are often trojans designed to exploit the very real need for legacy software access. Always verify file hashes if downloading from unofficial sources. While the 2018 version is an older release,
For a more practical look at how the software is used in the field, these peer-reviewed articles highlight HYPACK's role in modern hydrography: hypack 2018 manual