Haven't heard of this, That must be some integration or customization doing that, I am not sure but I would need my custom search using suitelet, and when you select any of the customer from the list , I would take his address and use some API like Google Maps API to give you directions ! another thing can be done without API is to mail you the map link with the location, So you can directly open that link in Maps app of your phone and get directions and route .....Probably overthing this 🤪