If you have a list of coordinates, then you know a priori what the maximum precision of the deltas is. If your delivery driver doesn't teleport at any point in

If you have a list of coordinates, then you know a priori what the maximum precision of the deltas is. If your delivery driver doesn't teleport at any point in the journey it's likely that you can shave quite a few bits off the top of each delta. For example, if your coordinates are precise to 1 angular meter, and the maximum delta in the list is 200 angular meters, then you only need 2x1 bytes for each coordinate.