Is there a way to do this? It could save a life

A friend's wife has been diagnosed with Early Onset Alzheimer's Disease.

She is a few years older than he, but at age 62, she already is having trouble remembering things she does. In fact, she was let go from her job two weeks ago because of something she knows she did, but can't even remember all of the particulars.

Years ago my mother developed Alzheimer's Disease, and she used to leave the house to wonder the neibhborhood. Dad would call me to help. He and I would then drive the neighborhood trying to "rescue" her. We would always find her sitting on someone's porch steps, exhausted, and frightened because she had no clue where she was or how to get home.

My father-in-law also developed the disease, and before we realized what was happening, he would get into his automobile and go wander half the state of Ohio!

My friend realizes his wife will eventually get to that same point, and begin wandering. It is part of the pattern in dementia patients.

Smartphones have GPS capability. His wife carries an iPhone.

Is there a way for him to track the co-ordinates of where she is, when she wanders off?

An app perhaphs that let him track her iPhone?

Thanks

:-Don