Basic MoBo Intercept Step-by-Step
1) Plot OwnShip Position
When you start MoBo the map area will be empty, left-click somewhere on the map to plot OwnShip position
2) Set OwnShip Speed/Heading Vector
Hover your mouse over the OwnShip circle and press the "V" key. Left-click and hold to move the vector around until it reflects the desired speed and heading. When you're done setting the vector remember to right-click to deactivate "Set Vector" mode.
3) Plot Contact Position
Move your cursor over the area where you'd like to plot a contact and press the "C" key. You can select the plotted contact by left clicking on it. You can left-click and drag to move the unit or, just left-click anywhere to move the selected unit to that location. Remember to righ-click when done moving to disable "Move" mode.
4) Set Contact Speed/Heading Vector
Same as you did for OwnShip. Just hover the cursor over the contact and press the "V" key.
5) Plotting an Intercept
With the above items plotted, you can hover your cursor over the contact and press the "I" key to generate an intercept location.
6) Determine Intercept Heading/Distance/Time
Hover your mouse over the intercept location and press the "N" key to create a little blue "node". You can select and move the node around just like the other units. Hover your cursor over the node and press "spacebar" to create a connection line to OwnShip. With cursor over node, press "B" to display bearing, "D" to duisplay distance, and "Y" to display the time to intercept.
When you're done it should look something like this:
In the example above I actually plotted two nodes and connected one to OwnShip and one to the Contact. Both nodes are plotted overlapping on the intercept point. That's how I was able to display the distance/bearing/time info for the contact... but usually that's not required.