[REL] 3D TDC and Radar Range Unit

[razark]

Originally Posted by I'm goin' down

My point about plot, was that the above post only mentions the "x". If you have to include the protractor angles, then time is awasting. You might as well pause the pause to make the entries. Also, the sub is on the move, and at flank can cover a lot of ground in 30 seconds. (Check the distance for one minutes at 20 kts.). That can affect the plotting of range.

As long as you're going in a straight line, it doesn't matter how far you've gone. As long as the "X" is pretty close to where you were when you made the reading, the angle should work. Jot down your bearing, range, and time on a piece of paper, and mark your "X" on the map. You can make several fixes on the target, each with an "X" to mark your position. When you have time, you can go back, draw in the angles and ranges, and figure out speed and course, without having to worry about getting back to the radar for your next observation right away.

Originally Posted by I'm goin' down

razark, I was joking about the speed calcs. I use the 3 minute rule unless I forget to look at the stopwatch, in which case I convert to seconds.

Hey, as long as you get the calculations right, you can use whatever units you like. Google says (10,000 yards) / (30 minutes) = 30,545.4545 furlongs per fortnight.

Originally Posted by I'm goin' down

razark, I did not know changing headings might affect the radar range and bearing readings adversely. If it is true, it is a good think to know. You might as well take the first reading when you are pointed at the target, otherwise you may have reading that are accurate but you could be getting further away from it.

Well, if you are trying to get a correct bearing on the target, and you're turning, holding the radar on it would be a bit tougher. The bearing you are trying to read would be constantly changing, and holding the beam to get the range would be a challenge.