Well I just looked at that MoBo of yours .. and it's quite cool.
It seems you concentrate on solutions where you know some of the solution parts. There is no magic word 'LEG' anywhere in the manual, and you only touch full TMA in the last paragraph. But as it is oriented toward WW2 it's quite ok.
On the other hand you could track ownship even with your tool. You have the icon of ownship on the map don't you ? That's it. Or you could plot course and speed and compute where your ship is at each moment. Then you would change course to make the leg, grab OS position after heading stabilizes and then you can plot new course again.
Btw. yesterday I have found great good reason why you need a leg. It never occured to me before. Well if you go straight at constant speed, there is always one incorrect solution. That is your own motion ! It lies and all LOBs, no matter how the LOBs goes.
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