Larry,
I'm neither geographer nor physicist, but here's my best guess: pretty much nothing!
Already, the poles don't line up, true north and magnetic north are all kitty-corner. We'll wobble a little bit, but we do that already, especially after a few barley-pops. And we might slow down or speed up while we're turning, but only by about 7 microseconds. Them durned government scientists a few miles down the road from here are already cheating with the world-wide clocks every few years.
http://en.wikipedia.org/wiki/Leap_second
If you want to read about the earth axis stuff, you have to travel to India:
http://timesofindia.indiatimes.com/...les-your-days-shorter/articleshow/7689494.cms
The *real* problem is the GPS in your Bass boat. Next time you get a hankering to motor over to Japan, you'll go all that way, tie up where the GPS tells you to, and step off the boat, right into ... the water! You'll be seven feet short! And be careful about falling into the water, you won't be too far from the
Marianas Trench!
Thanks,
Bill