By calculations, I meant “my draft 7.2 meters, and the chart says that area is 7, is there enough water over there?” Its more 2nd grade math than a calculation.
Although, it does get confusing when ENCs have their depths in meters and american ships have their drafts in Feet, thats when there is just an ounce of math to do.
With the effects of shallow water and squat, the anti grounding alarms may not not have helped, but youte right, if the safety contours and depths were set improperly, or spot soundings turned off, I suppose thats how a Jr mate could justify such a maneuver. But still the root cause isn’t entirely on the captain getting dinner at that point.