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Hydrostatic pressure is not a primary concern in GNSS (Global Navigation Satellite System) surveying because GNSS measurements are made using satellite signals that are largely unaffected by underwater conditions. The strength and accuracy of these signals depend more on atmospheric conditions and multipath effects rather than underwater pressures. Therefore, while hydrostatic pressure can be critical in various marine applications, such as underwater surveying with sonar, its relevance in GNSS surveying is minimal and does not directly impact the data collection process.

Additionally, other factors like obstructions above water and atmospheric phenomena have a much more significant effect on the accuracy and reliability of GNSS positioning than any hydrostatic pressure concerns that might arise in aquatic environments. So, in the context of GNSS surveying, the consideration of hydrostatic pressure is generally considered irrelevant.