As if there weren't enough reasons already to ban cell phones from the golf course....
I'd put mine on 'airplane mode', especially if the mobile phones were banned. You could still use the apps.
Shivas, I am not suggesting you use the spirit level to help you read putts - that would be an illegal device wouldn't it. I am suggesting the spirit level as a means of determining green slope, from a GCA perspective. I would like to know how steep the slope is on some greens, and just where the green inverts from back-to-front over to front-to-back. I would also like to know how severe the slope of some fairways are that do not have excessive roll, versus other fairways that are just roll-fests.
As for iStimp - I can't imagine that, yet.
James B