The thermometer.
The thermometer doesn't work when wearing the watch (it picks up on your body heat and never gives an accurate read). Not having temperature in digital makes this a doubly bad design flaw.  Additionally, you can get an accurate temperature read only if not wearing the WRISTwatch for 15 minutes?!! Buffoon-stupid stupid design.

The compass.
Sigh the compass...the compass worked, let's put it this way, when I already knew the NESW directions and could correct the always-malfunctioning compass.

This was too clunky, heavy, and the band broke.

Terrible watch.