Erm, they are two different instruments...?
The Electronic Attitude Director Indicator (EADI) displays the attitude.
The Electronic Horizontal Situation Indicator (EHSI) displays the horizontal situation.
The clue is rather in the name. They are both Electronic Flight Instrument Systems, but replace the old Attitude Indicator (or artificial horizon) and directional gyro instruments with a nice clean electronic display which can also show a lot more information.
Last edited by RTN11; 18th Jan 2013 at 14:36.