The only time anyone would notice slight errors in turtle position was trying to do animation by drawing over a previous drawing with an XOR or ERASE or backgro

The only time anyone would notice slight errors in turtle position was trying to do animation by drawing over a previous drawing with an XOR or ERASE or background color pen. It might be necessary to explicitly reset the turtle position to the original start. I do remember having to be careful with the anti-aliasing so that when pointing in any random direction FD 100 RT 180 FD 100 would draw the same pixels in either direction.