I don't have any info on intentional tracking but Macs surely do leak a lot of data. If you install Little Snitch you will have a better feeling of what is being sent over the network. These are the rules that I have regarding apple:
The mac is able to change your timezone depending on your location. I don't think it would be too hard for Apple to build a precise profile of my location and movements if they wanted to.
* aosnotifyd: aosnotify.me.com * AppleIDAuthAgent: identity.apple.com * apsd: push.apple.com * assistand: apple.com * helpd: apple.com * imagent: apple.com * IMRemoteURLConnectionAgent.xpc: apple.com * ntpd: time.euro.apple.com * SoftwareUpdateAgent: sw.apple.com storeagent: apple.com * SyncServer: configuration.apple.com * ubd: configuration.apple.com * XProtectUpdater: configuration.apple.com
The mac is able to change your timezone depending on your location. I don't think it would be too hard for Apple to build a precise profile of my location and movements if they wanted to.