Quote:
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.