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Once I've set my firing solution, using the O'Kane method, I often then take quick peeks at my target as it approaches. Sometimes I'm tempted to send new data to the TDC ... forgetting that my scope is locked on target and not aligned to my firing solution. Supposedly, sending speed data won't cause an adjustment to bearing ... but it's best not to take any chances. If using the O'Kane method and you need to correct what's already in the TDC, make sure your aiming device (TBT or periscope) is "on the mark" (set to where you want it to be when you start firing) before sending the new data.
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