Height of Eye = 20 feet.
Here its later in the day.
Note: I couldn't get a decent noon sight using the Observation scope due to bobbing action and no horizon to gauge by. So, I waited until later in the day.
Distance = (Speed knots x Time in minutes) / 60
It's 620 minutes after my last sun sight 620 x 11 / 60 = 113.6 nm. I advance my morning position 113.6 nm,This gave me a new Assumed Position of 30°N x 163°E took another sun sight and measured it at 26° 40' altitude......see pic.
The Celnav puts me about 2 nm from the sub's icon and about 4 nm from my DR position.