WesK agree on gps vs chart accuracy 100%. I was observing easily 50 yards off here.. in a 150 yd wide body of water. and I'm looking at at least two sometimes three different charts from different suppliers. (Garmin was worst in terms of having actual soundings)
As for collecting soundings, I understand incorporating the offset is important, but honestly, using a little math to average and throw out stuff off 2 sigmas would be lightyears ahead of an inaccurate chart. So much data being collected and effectively thrown away, a shame.
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