Microburst2002, OLD is not a calculation (perhaps you implied otherwise – 25 Oct).
The task is to compare LDA with LDR; where LDR requires assessment of the current situation before looking-up/computing the appropriate distances.
Thus OLD reinforces the need for situation assessment, a mental trigger for threat and hazard management before landing; a reminder to think.
“Overruns always happen in wet or contaminated runways.”
Never say (or imply) never.
A dry smooth desert runway covered in a recent layer of clay dust and an ill-chosen downwind approach – the operator didn’t even published wet landing data.
Might the use of OLD aided situation assessment?