I actually call my Padrone (Master) whenever I go anywhere.
If he is not at home and I need to go out, I call him before I leave, and when I reach wherever I am going.
I tell him how long I think I might be there, then call him again when I am leaving.
If he is at home, I call when I reach my destination, and call again to let Him know I am leaving and where else I may be going if not going directly home.
I have found this gives me a sense of peace, security, and love deep inside myself, as well as giving my Padrone an added sense of security and peace of mind in knowing his slave is well.
He implemented these measures because of my epilepsy, but also because He knows me so well, that he understands that any type of rule like this, that he puts in place, makes me feel that much more safe, secure, loved, and protected, especially if he is not with me.