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Navigational calculation of body count? (4,9)

Ross

I believe the answer is:

dead reckoning

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

'navigational calculation' is the definition.
(I've seen this before)

'body count?' is the wordplay.
I cannot really understand how this works, but
'body' could be 'dead' (synonyms) and 'dead' is found in the answer.
'count?' could be 'reckoning' ('reckoning' can be a synonym of 'count') and 'reckoning' is found within the answer.
No letters remain.
This may be the basis of clue (or it may be nonsense).

'of' acts as a link.

Can you help me to learn more?

(Other definitions for dead reckoning that I've seen before include "Estimation of position at sea by reference to course steered and distance run" , "Navigation without using the stars" , "Method of estimating ship's or plane's location" , "One way to chart" , "can tell you where you are" .)

I've seen this clue in the Sydney Morning Herald.
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