Crossword Genius

Finding where the ship is and adding up the fatalities? (4,9)

Ross

I believe the answer is:

dead reckoning

I'm a little stuck... Click here to teach me more about this clue!

This clue could be a double definition.

'finding' is the first definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe you can see an association between them that I don't see?

'where the ship is and adding up the fatalities?' is the second definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

Can you help me to learn more?

(Other definitions for dead reckoning that I've seen before include "Estimating sea position blind" , "counting the casualties?" , "Method of estimating ship's or plane's location" , "Estimation of position at sea by reference to course steered and distance run" , "Checking losses in battle" .)

I've seen this clue in The Irish News.
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