Mobile app for locating customers or leads in Zoho

Mobile app for locating customers or leads in Zoho

Does anyone know of of there is a mobile app that would allow me to see customers or prospects that I have in Zoho on my iPhone or iPad when I'm calling on an account that near their location?

    Example I have a meeting with a customer in littletown USA.  I would like to know if there are leads or other accounts within 25 miles of that location.