f = ? (Wasn't this finish?)
i = ? (Interrupt?)
n    =    calculate depth (AUKE)
r     =    refresh
key_left      =     change beam to port
key_right    =    change beam to starboard
key_up    = change TWTT shorter (duh..)
key_down = change TWTT longer (duh..)
p = switch to port side
s = switch to starboard side
w = write out (AUKE - should make this automatically animated gif and store all the images in separate folder)
c = ? WC 2d image
z = calculate zoomed image for every ping
space = back to normal view