manual targeting - speed

[kstanb]

Originally Posted by Rockin Robbins

If you are using radar, this is a dead accurate number you can rely on. With radar, you have the additional advantage of not having to expose your periscope with the target close aboard to obtain the information. With metric, the number of hundred meters traveled between two positions 3 minutes fifteen seconds apart does the trick.

Maybe a stupid question, but how do you use radar for two points speed measurement?
is there a button to send radar range to TDC? like the active sonar approach?
I use radar just to figure out an aprox. range to target, but I have never been able to get exact distance