[REL] Radar Training for Nisgeis' 3D TDC and Radar Range Unit UPDATED: 7/31/10

[sergei]

Originally Posted by I'm goin' down

First, in Channing's tutorial he notes that after plotting 3 or 4 entries one has determined the target's preliminary range, course and speed. Actually, you one has not determined preliminary speed. One has determined preliminary range and course only. I think the comment re speed is a mistake

Sure you have.
You have a nomograph, don't you?
It's on the right of your nav map.

Take a note of what time you start the plot. Then whenever you add a mark, measure the distance from the first mark to the current mark, note the elapsed time, and use the nomograph to estimate speed.
This is how I have been estimating speed, with very good results.
No need to mess around with the stopwatch, or estimate speed button, or make your plots exactly 3 minutes apart.
Also has the advantage that over time, as the plot develops, it will tend to become more accurate, as minor deviations in the plot become less important.