Built-In Maneuvering Board

[don1reed]

Some of us have been playing SH3 without the U-boat icon being displayed on the F5 screen with the hope of creating a greater challenge and using real navigation skills, i.e., allowing for a virtual “sextant” positioning by only clicking CNTL-Left mouse button whenever the weather is clear enough to use a sextant while surfaced. We then update our chart with an “x” to mark our position. We do not use this virtual sextant after evening twilight or before morning twilight, as real mariners do/did. You can read more about this interesting challenge at:

http://www.subsim.com/radioroom/showthread.php?t=93937&goto=newpost
However, the reason I’m bringing this up is show another method of determining target speed by using the F5 chart screen as a “maneuvering board” aka MOBOARD.

Given:

Own course: 286° true.
Own speed: 13 kn.

We can represent this info with the use of the compass tool, i.e.,




Let the center of the compass tool circle equal your position.
Strike off the radius angle to equal your heading and radius length equal your speed. I use the built-in protractor to measure the angle.

Watch Officer sights a ship BR 071 @ 9700m.

From our position (center of circle) use the ruler tool to mark off the range and bearing. After this, place an “X” at the target ship’s location.




3:15 later, the Watch Officer (when asked) informs us that the target is now BR 78 @ 6500m. Again, use the ruler tool and “X” to display this update.





Now, take the compass tool and connect the target ship’s relative movement. Drag this small relative circle by its center to the leading point (speed radius) of our circle. This provides us with the target’s relative heading and speed.




We can now take the ruler tool and draw a line, completing the vector; from our position to the point of the target’s relative speed/heading line…this now displays the target’s TRUE Course and Speed. C271 S11.6.

[SkvyWvr]

Originally Posted by don1reed

Some of us have been playing SH3 without the U-boat icon being displayed on the F5 screen with the hope of creating a greater challenge and using real navigation skills, i.e., allowing for a virtual “sextant” positioning by only clicking CNTL-Left mouse button whenever the weather is clear enough to use a sextant while surfaced. We then update our chart with an “x” to mark our position. We do not use this virtual sextant after evening twilight or before morning twilight, as real mariners do/did. You can read more about this interesting challenge at:

http://www.subsim.com/radioroom/showthread.php?t=93937&goto=newpost
However, the reason I’m bringing this up is show another method of determining target speed by using the F5 chart screen as a “maneuvering board” aka MOBOARD.

Given:

Own course: 286° true.
Own speed: 13 kn.

We can represent this info with the use of the compass tool, i.e.,




Let the center of the compass tool circle equal your position.
Strike off the radius angle to equal your heading and radius length equal your speed. I use the built-in protractor to measure the angle.

Watch Officer sights a ship BR 071 @ 9700m.

From our position (center of circle) use the ruler tool to mark off the range and bearing. After this, place an “X” at the target ship’s location.




3:15 later, the Watch Officer (when asked) informs us that the target is now BR 78 @ 6500m. Again, use the ruler tool and “X” to display this update.





Now, take the compass tool and connect the target ship’s relative movement. Drag this small relative circle by its center to the leading point (speed radius) of our circle. This provides us with the target’s relative heading and speed.




We can now take the ruler tool and draw a line, completing the vector; from our position to the point of the target’s relative speed/heading line…this now displays the target’s TRUE Course and Speed. C271 S11.6.

Genius!

[don1reed]

Here's to old salts

[gutted]

maybe i'm missing something.. but what was the point of moving it infront of you.. when you already had his heading and speed plotted?

[don1reed]

The Maneuvering Board method allows you to plot the target(s) using their relative position from one uboat position.

All plotting systems shown thus far in these forums only demonstrate a method that you must plot both the target and the uboat's progress within the timed run ... there is nothing wrong with doing it that way; however, within the military combat control centers (CIC) plotting is accomplished using the MOBOARD method.

What I am trying to illustrate here is that there are other methods available that are more in keeping with history, and especially those who would like to try navigation without the "training wheels" of the waypoint tool and the "moving" U-boat icon, or any ship icon for that matter, on the F5 screen.

Relative movement means that it appears that the target is moving in a particular direction due to the movement of both vessels. The Moboard allows the user to simplify this relative movement via vectors and precisely figure the target's TRUE course and speed. Once computed, the reverse may then be applied with the target placed in the center and then vectors applied to the U-boat to figure distance and speed necessary to make an end round for future attack.

A real MOBOARD looks like this:


You can find these for free DL if you wanted to use an off-computer, external method as well.
cheers,

[gutted]

that still doesn't explain why you moved it to where you did.

i just don't get whats going on in your last few steps.

[robj250]

Originally Posted by don1reed

The Maneuvering Board method allows you to plot the target(s) using their relative position from one uboat position.

All plotting systems shown thus far in these forums only demonstrate a method that you must plot both the target and the uboat's progress within the timed run ... there is nothing wrong with doing it that way; however, within the military combat control centers (CIC) plotting is accomplished using the MOBOARD method.

What I am trying to illustrate here is that there are other methods available that are more in keeping with history, and especially those who would like to try navigation without the "training wheels" of the waypoint tool and the "moving" U-boat icon, or any ship icon for that matter, on the F5 screen.

Relative movement means that it appears that the target is moving in a particular direction due to the movement of both vessels. The Moboard allows the user to simplify this relative movement via vectors and precisely figure the target's TRUE course and speed. Once computed, the reverse may then be applied with the target placed in the center and then vectors applied to the U-boat to figure distance and speed necessary to make an end round for future attack.

A real MOBOARD looks like this:


You can find these for free DL if you wanted to use an off-computer, external method as well.
cheers,

I purchased a pad of these but found them of no use because of the "short" distances they use on the sheet. I did not find it useful for long plotting.