Spectra Precision Survey Pro v4.5 Recon and Nomad Reference Manual - Manual (Page 395)

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PVC sta.: is the station at the PVC.
PVI sta.: is the station at the PVI.
PVT sta.: is the station at the PVT.
elev.: is the elevation for the respective point.
Hi/Lo sta.: is the station where the vertical curve has a tangent
equal to zero (the crest of the curve).