There is a neat mod/feature in GW (also available as a standalone mod, I suspect) that gives you a couple of pull-down charts you can drag over your nav map screen that give you the distance (in km) that a ship will travel over various time periods (one sheet lists time in hour increments, the other sheet in smaller increments - maybe 10-15 minute chunks) at various speeds - a very handy way of doing the conversions without having to compute anything.
Since the TDC range dials are marked in meters and not nm, having the nav map tool measure off meters actually is a good idea - otherwise we'd just have to do conversions the other way to set up our shots.
__________________
|