Mapview Showing Closest location

Mapview Showing Closest location

Building an iPhone app for a business with multiple locations. I have a
mapview that shows all the locations, I got it to work to show the
locations on the map. Zooming out you see all locations that I have
specified. Issue is I need it to show closest location first to the
current location of the customer.
Key points: 1. Using property-list (config.plist) to specify the
locations. 2. It does show the blue dot for current location and that is
accurate. When zooming out and selecting any of the location I have it set
to take you to google maps and that is all accurate from current location
to that specific business location. 3. This is for iPhone using of course
xcode.
Thanks.