Knots meters & time calculations

[robj250]

Originally Posted by von Zelda

There is a simple way to determine intercept course but it is alittle hard to put into words. I'll try.

1) Draw a line that represents target's course
2) Draw a line from the target to your ship and beyond.
3) Having a estimate of targets speed in knots, draw a circle from the target's present position with the radius of the circle equal to the speed in knots of the target.
4) At the point that this circle intersects the target's course line, draw another circle with the radius of your boat's speed (usually max. speed of 15 -17 knots depending on weather).
5) Observe the point of this second circle that intersects the line from target to your boat. (It is the second intersect point which gives the smallest angle to intercept.) This the center point for your angle tool. So, using the angle tool, draw a line from the target to the above stated center point and click, then draw the second line of the angle toward the point that the first circle intercepts target's course. Read the angle produced by the angle tool, this is your angle for intercept.
6) Now redraw, using the angle tool, this above angle from your boat's position toward the target's course. This gives you an estimated point of intercept based on the speed of the two boats. Adjust your course. Often you'll want to adjust this angle a little in order to arrive at an intercept point well before the target!

I assume I am supposed to do this during the game on the nav map.

To determine time of intercept:
1) Your speed in knots X 1.852 = kilometers per hour
2) Measure distance to intercept point
3) Estimated distance divided by kilometers per hour (#1) = hours and minutes measured in tenths.

Hope this is helpful.

re #2 measure distance to intercept point - pardon my ignorance. but my brain does not function very well with the mental problems I have, so what do I use to measure the distance with to get kilometers?

[XLjedi]

First off, assisting with intercepts is one of the main reasons why I built MoBo.

However, if you like Excel, I can lay the calculations bare for you and maybe after reviewing it you will eventually come around to the notion that you can't just build a table of times/speeds/courses for intercepts. There's a reason why navy ships have a maneuvering board station.

Intercept Math in Excel

But who knows... maybe you'll be able to piece something together that will help you.

[robj250]

Originally Posted by aaronblood

First off, assisting with intercepts is one of the main reasons why I built MoBo.

However, if you like Excel, I can lay the calculations bare for you and maybe after reviewing it you will eventually come around to the notion that you can't just build a table of times/speeds/courses for intercepts. There's a reason why navy ships have a maneuvering board station.

Intercept Math in Excel

But who knows... maybe you'll be able to piece something together that will help you.

Thanks for you input guys.
By using my original spreadsheet and plugging in the Distance Time suggested by von Zelda, the spreadsheet works fine.

Rob

[robj250]

Originally Posted by aaronblood

First off, assisting with intercepts is one of the main reasons why I built MoBo.

However, if you like Excel, I can lay the calculations bare for you and maybe after reviewing it you will eventually come around to the notion that you can't just build a table of times/speeds/courses for intercepts. There's a reason why navy ships have a maneuvering board station.

Intercept Math in Excel

But who knows... maybe you'll be able to piece something together that will help you.

Thanks for the Excel sheet. I had to open it with Quattro Pro then save it for the year of my Excel.

I'll try to figure out all this information, and your diragrams using your special tool and the information in the spreadsheet. However, it looks quit complicated for me.

I will send you my re-designed spreadsheet.

Yes, I realize that's why the Navy has a Manouvering board. I bought some of those sheet, but I find it combersome to use.

Thanks Rob

[XLjedi]

Originally Posted by robj250

Yes, I realize that's why the Navy has a Manouvering board. I bought some of those sheet, but I find it combersome to use.

Hehehe...

Yeah, I find the paper one's cumbersome to use too!