Yes, the map rotated in real time with the vehicle centered. I was a software developer writing software using Etak in '88-'89 time frame. That only worked when

Yes, the map rotated in real time with the vehicle centered. I was a software developer writing software using Etak in '88-'89 time frame. That only worked when focused on a single vehicle, as I remember writing the code to do the same for groups of vehicles and Etak wanted to purchase that code from my employer. they probably got it, as my lead developer I worked for ended up working at Etak after I left. Interesting side-fact: we used time-of-flight with beepers placed in the cars and ordinary trigonometry to increase accuracy. Worked like a charm.