Estimate Function

Good day,

I see under the [Professional Radar Simulation] section you can get/enter an estimate. Is this a pilot estimate? or a system estimate?

If so how does the function work? Does the target have to be non-radar for it to enter/populate an estimate for the next fix?

I’ve tried the .est function and could not get it to work.
Example .est YBC 2122


You can enter estimation data only to an uncorrelated flight plan.