I should have said "bearing / range measurement... If you do not "Lock" on the target, and turn on PK, the PK will remember the last set of data input to it. You move the scope, but the angles don't change. If you don't engage the PK, the angles will change when you move the scope... if you do engage the PK, you could move your scope for your next measurement, turn the PK off, then turn it back on and it would update the angles, but you have to shoot when you turn on the PK in that situation, else don't turn it back on, or you'll have that set of bearing stuck in the TDC... I said that in about twice (at least) the words needed... sigh - sorry.
