rulefan
Tour Winner
I'm guessing that the problem is that the functionality of a DMD is defined - whereas the functionality associated with a mobile phone cannot be defined - it could include be anything and become anything - including functionality that we haven't thought about. As soon as the R&A allow mobiles they open the door to they know not what. And once open, then future super whizzy apps for mobiles will be walking through an opened door that will be difficult if not impossible to shut.
To me it seems that they looked at the compass app as an app that could possibly in some way help in golf that is clearly not distance measuring; and that is on most if not all smartphones - and used that as the door stop. A compass isn't distance measuring and it's on all smartphones - so if your device has a compass - it's illegal. Has that changed?
Yes a compass is no longer 'illegal'.
14-3/4
Use of Compass During Round
Q. A player uses a compass during a stipulated round to help determine the
direction of the wind or the direction of the grain in the greens. Is the player
in breach of Rule 14-3?
A. No. A compass only provides directional information and does not gauge
or measure variable conditions or assist the player in his play. (Revised)