Vertical Adjustment (Bowditch traverse adjustment option)

Heights are adjusted by the proportional distances method only if horizontal adjustment is to be made. If the start-point and end-point heights for any traverse section are valid (i.e. are not null heights) then adjustment is made.

In the Survey menu Traverse option, heights are adjusted provided that the vertical component values are valid (i.e. not blank or non-derivable) and there are no height values entered mid-traverse in the ToRL fields. If a ToRL value is encountered, it is always stored, but the traverse cannot be adjusted - when a ToRL value is found, subsequent heights are computed relative to that value until the end of the traverse or until a new ToRL value is read, but the heights are not adjusted.

When processing a data file in the e-Data option, if a traverse section begins and closes on fixed points and there are valid vertical components (VCs) for every traverse leg, the point heights will always be adjusted.

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