PINGO-LIKE FEATURES

Undetected pingo-like features, hazardous to navigation, may exist in the areas outlined in magenta and designated "P".  These features could reduce the depth to approximately 30 per cent of that shown, e.g.  where depth of 50 metres is charted, a depth of 15 metres could exist nearby.  An echo sounder may provide little or no warning when approaching a pingo-like feature.

