[TMO] nav maps distance/speed charts

[DigitalAura]

Can someone tell me how to use the tools on the RIGHT side, where the various scales are in the TMO mod?
I can't figure out what they are for or how to use them?

[gAiNiAc]

What you do is draw a line from the target speed through the time scale and continue through the distance scale.......It's called a nomometer.....

[Frederf]

The nomometer is basically a static slide rule or calculator. When you draw a straight line through all three scales, the crossing points match up in a meaningful mathematical way. Draw a line through 30 minutes and 5 kts and I guarantee you that the line will also pass through the 5000 yd mark on the range scale, for example.

Hint: 0.5 hrs x 5 nm/hr = 2.5 nm (5000yd).

[Armistead]

If you ever plan to play with contacts off the nomo is the most important tool you can have....learn to use it.

[green_abobo]

Originally Posted by Armistead

If you ever plan to play with contacts off the nono is the most important tool you can have....learn to use it.

any suggestions on how you acheive this?

perhaps a link w/ screenshots and contacts that demonstrates?

so i can practice. its hard to read all the values because they're so tiny.

i understand the principle of it and realize why thats important. it's just the function and the procedures involved that has me perplexed. is it one line through the time,distance and speed variables? does this line have to be straight across, or can it be diagonal through the nomograph?

i'm also trying to learn how to use MoBo (v 1.2) as well. i know the basics. running the .exe file and using print screen to save nav map image to clipboard. apart from that.... i know nothing. there doesnt appear to be a readme file so i'm in the dark. any advice you can offer?

i'd appreciate it.

thanks.

[DigitalAura]

Originally Posted by Frederf

The nomometer is basically a static slide rule or calculator. When you draw a straight line through all three scales, the crossing points match up in a meaningful mathematical way. Draw a line through 30 minutes and 5 kts and I guarantee you that the line will also pass through the 5000 yd mark on the range scale, for example.

Hint: 0.5 hrs x 5 nm/hr = 2.5 nm (5000yd).

Perhaps you could give me (us) a practical application of this though, so that we might better understand why and when you would need to run a line through the "30 minute and 5kts" points. Thanks !

[tomoose]

Maybe this explanation will help. The nomograph/nomometer allows you to do quick calculations in order to determine information on a moving target.
For example;
you have a report of a ship at point 'X' heading NW at medium speed. I normally interpret 'medium speed' as 7 or 8 knots. So I have a rough posn on the map based on the report, a direction of travel (NW) and an approximation of speed. Let's say I want to know how far the target will travel in 2 hours. I use the nomograph and the ruler tool and click on 8knots and run a line to 2 hours (120 mins) the line will intersect a distance (I don't have the nomo so I'll say 10 miles for the sake of this example). Using this type of info you can calculate roughly where the ship will be (i.e. 10 miles further along his NW course assuming he doesn't change course or speed) and when (if your report states he was at 'X' at 1000hrs then your calc will put the ship 10 miles further NW at 1200hr) and conversely adjust your speed and course to get into a favourable position in time. This is all based on receiving a radio position report and admittedly is very rough. You'll still end up searching once in position but I've used it successfully to get ahead of a target then dive, listen and voila!! a distant sound of propeller coming from the right bearing. If you have a long distance visual then the nomograph can be used much more accurately to plan your intercept course etc.

Hopefully that didn't confuse things. I'm sure one of the experts here can probably expand (and correct) what I've said.

[DigitalAura]

Originally Posted by tomoose

Hopefully that didn't confuse things. I'm sure one of the experts here can probably expand (and correct) what I've said.

No, this is a very good illustration! Thanks moose!

[green_abobo]

Originally Posted by tomoose

Maybe this explanation will help. The nomograph/nomometer allows you to do quick calculations in order to determine information on a moving target.
For example;
you have a report of a ship at point 'X' heading NW at medium speed. I normally interpret 'medium speed' as 7 or 8 knots. So I have a rough posn on the map based on the report, a direction of travel (NW) and an approximation of speed. Let's say I want to know how far the target will travel in 2 hours. I use the nomograph and the ruler tool and click on 8knots and run a line to 2 hours (120 mins) the line will intersect a distance (I don't have the nomo so I'll say 10 miles for the sake of this example). Using this type of info you can calculate roughly where the ship will be (i.e. 10 miles further along his NW course assuming he doesn't change course or speed) and when (if your report states he was at 'X' at 1000hrs then your calc will put the ship 10 miles further NW at 1200hr) and conversely adjust your speed and course to get into a favourable position in time. This is all based on receiving a radio position report and admittedly is very rough. You'll still end up searching once in position but I've used it successfully to get ahead of a target then dive, listen and voila!! a distant sound of propeller coming from the right bearing. If you have a long distance visual then the nomograph can be used much more accurately to plan your intercept course etc.

Hopefully that didn't confuse things. I'm sure one of the experts here can probably expand (and correct) what I've said.

no, thats an excellent example. i have figured out how to use the nomo. to figure the contact's speed only.

with this example, i can now use it in reverse and plot where the contact's gonna be in what ever amount of time i choose,and can be there,set up, when it arrives. thanks.