How to design a waterproofed GPS tracker for Alzheimer patients?

How to design a waterproofed GPS tracker for Alzheimer patients? Recall Tesla. We need no charge plug anymore http://ow.ly/14ycz

10.02.2010  Remark of the author after sending the tweet:

The charging plug was still the bottleneck for any waterproofed GSM / GPS tracker.  I am glad, that somebody reworked Tesla´s theory. In 1897  Tesla filed the first of his patent applications dealing with wireless transmission.