I have a set of data that I created from gps locations of images. The locations are in decimal. I don't know what projection was used when the data was captured. I used QGIS to display the data with a forced projection (EPSG:28355 - GDA94 / MGA zone 55) but the data looks wrong. The resulting map is off by nearly 90 degrees and the circular streets are skewed. So I am assuming that the projection is wrong and I can't work out how to change it. Can someone help?