Why did the anzacs land in the wrong place?

When the ANZACS landed at Gallipoli they were ambushed by Turkish troops as they were off the coast of Turkey.

The landing occurred in the wrongji place - one mile too far north due to strong tides which were not taken into account. This meant the terrain was not at all favorable and steep exposed hillsides had to be climbed. The Turkish soldiers were already encamped in this area and simply shot many ANZACs down as they came ashore. No more ground was ever gained than what was occupied by the ANZAC troops on the first day.