[msumpsi]

Hi Wernersobe, i was just wacthing your tutorials about how to use sonar for firing solutions and i notice that you ha you use the nav map to plot the course and find out the speed of the target. I was thinking about it, and i am just wondering why it cannot be used like the optics. In the optics use of TDC nav map is not needed. All you need to do is you send 2 bearing and range inputs fot the TDC solver to give you the targets course and speed, assuming is traveling in straight line. This in terms means that the TDC does keep track of time elapse in between measurements, so it should work the same way with sonar. Essentially by other means you send range and bearing to the TDC twice in the same way you do with optics, but it does not seem to aknolegde these data input and it treats them as 2 unrelated measures. That is the reason one has to use nav map to plot solution by hand, but it seems to me incoherent with the wat the TDC works with optics since one is basically oing the same task either with optics or with sonar.