GPS tracking plugin

I am looking for tracking my employees who work in the field for street collection and i want them tracked by gps or iphone etc .
What plugin is most robust and in use which gives solution for this work

My requirements will only be this.

1- At starting job they switch on gps / Iphone.
2-Route is sent on my WordPress website with clear map of road etc.
3-Time they spent on route .
4-Unlimited devices and unlimited routes be saved on my website and they may be deleted after every thirty days or so.

Above is minimum requirement and if more things come then it will be ok .

Please advise which plugin is best.