Taken from the survey report:
This report details the survey work carried out on Macquarie Island in April 2012 on re-supply Voyage 6 by Australian Antarctic Division Mapping Officer, Henk Brolsma and UTAS final year survey student, David Cromarty.
The first task of the survey team was to calibrate the tide gauges and second to bring the location of the station area buildings up to date.
Second ... priority was to survey the natural surface level of; a) The isthmus for erosion studies and b) Wireless Hill to prepare an accurate DEM for the hill.
The survey-mapping brief lists the following tasks in order of priority:
1. Calibrate the tide gauges in Garden Bay using the GPS in the float technique, 2. Level between the tide gauge bench marks and the tide gauge reference points, 3. Survey location of new buildings, 4. Survey new tourist walkway and 5. Survey natural surface profiles of the isthmus.
See the report for full details.