if they had of been plotting the position on a chart, taken from the Lat/Long readouts, then they would have known where they were, rather thinking they knew where they were.
Yes. I think it was remiss of Captain Collins not to delegate the task of plotting INS data onto a topo chart. He certainly had the manpower. He had two FOs and two FEs. You don't need to be a formally qualified Nav to plot a Lat/Long onto a chart which has a graduated border. A Boy Scout should be able to do that.
Actually, I suspect that someone on the flight deck was trying to relate their actual position to some kind of map or chart.
Note that somebody says "Yes I reckon about here".
That sounds to me like somebody pointing at a chart or a map.