Author(s)

J. Jacobson

Abstract

In the middle of the 1990's the thought of a more accurate measuring system for the Vasa began to take shape. We knew that the ship moved but we did not know exactly where and by how much. If one does not know how the hull moves, it is very difficult to calculate the best counter-measures. Since we wanted to monitor the movements of the ship over time, we arrived at the conclusion that a geodetic system would best serve our needs. Together with the Royal Institute of Technology in Stockholm we started to plan for a geodetic measuring system in the museum. Old boreholes were used to attach 350 reflective targets to the hull. A total station was bought and with this station we can get a very high level of accuracy, down to a few tenths of a millimetre. The plan is to measure the ship four times a year. We have now measured the Vasa six times and the results so far indicate movements in several areas of the ship. The clearest trend, t

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