Oooooh thanksFrom the coordinates in your screen shot above, 41.4760, 74.0367 to the antipodal point from your starting point, you'll need to follow a bearing of ~ 158.5°
I was driving, but it's gone dark again and I'm hitting too many rocks.
I've moved on a fair bit from there - I'll just get my current position. How do you work that out? I haven't had a chance to puzzle it out yet.