Quote:
|
Originally Posted by Silverleaf
6) Use Compass and draw circle by clicking on end point of measured distance (in this case 60 kms) and draw a circle = 10 X (my intended speed for interception).
In this case, I'm close (still 15,000 meters away) so I will do 3 kt, staying submerged since it's daytime. I draw a circle 30 kms in size.
7) Where the circle intercepts MY current path is what I'm after here, yes?
|
No! I'm afraid you made a mistake at point 7.
Take a good look at step 5 again in Dantenocs procedure:
http://www.subsim.com/phpBB/viewtopi...er=asc&start=0
The (ownspeed)circle should cut the bearingline from the uboot (initial position) to the target (initial position). It's those 2 protractor legs between the target icon and the number 97 in your picture. You chose a ownspeed of 3 knots, probably because you wanted to stay submerged. However, you should first have found out what was REQUIRED, THEN choose your speed: the speed that is required or faster. As you can see the 3 knot circle never even touches the bearing line to target (those 2 protractor lines mentioned above). If you used an intercept speed of 5.5 knot the circle would about touch the bearingline and it would be the absolute minimum. Choose a higher speed to get an intercept course that is turned sharper towards the target.
HOWEVER, you GUESSED his speed to be 6 knots. It could be that it had a speed between 7 and 8 knots. Then you would end up behind the target. Personally I assume their speed is worst case (slow: 7.5 knots; trust me, if it was 8 knots it would be reported as medium speed) and wait for it to close up on me, or set course to meet when I arrived on his course track well before him (outside visual or hydrophone range).
I don't see where you got the idea you are 15km away from him, the picture shows you were at approximately 35km initially. Definatly a surface! intercept!!!
If you then follow the steps as you did you should arrive at the propper intercept course.
Small tid-bit
The initial range to target seemed to be about 35 km. For this reasonably close range you may want to use smaller multiplication factors (the 10 you use), something like a straight 1knot-to-1km or 1knot-to-5km. 10km makes the intercept triangle larger than the real distances. This could require the bearingline to target to be extended beyond your initial position to make the ownspeed-circle cross it.