Jumping around in visual mode

Yesterday, someone asked on IRC how to jump around in visual mode (V key to activate it, and ? for help, as usual). This is a perfect pretext for another blogpost. To move in visual mode, you can use: g to seek to the begining of the file G to seek to the end of the file hjkl to move, à la vim. mK to set the mark K at the current offset 'K to seek to the previously set K mark.