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TorpX · 04-25-11, 04:30 PM

The formula quoted is accurate as far as it goes, but does not take into account your subs movement. If you want to estimate speed while moving you must account for both your own speed and the relative bearing.

I used to use the following formula:

speed (kts.) = .59 target length (ft.) / time(sec.) + sub speed(kts.) * sin target bearing

if your sub and target are going in opposite directions then the last term sub speed(kts.) * sin target bearing is subtracted.

04-25-11, 04:30 PM	#2
TorpX Silent Hunter Join Date: Sep 2010 Posts: 3,975 Downloads: 153 Uploads: 11	The formula quoted is accurate as far as it goes, but does not take into account your subs movement. If you want to estimate speed while moving you must account for both your own speed and the relative bearing. I used to use the following formula: speed (kts.) = .59 target length (ft.) / time(sec.) + sub speed(kts.) * sin target bearing if your sub and target are going in opposite directions then the last term sub speed(kts.) * sin target bearing is subtracted.