Apple Maps arrived for the Mac as part of OS X Mavericks, offering Mac users the ability to use Apple's own mapping service. Among the various features of Maps, such as 3D views and Flyover, directions you find within the Mac app can be shared in various ways, from email and social networks to directly to iOS devices.
Launch the Apple Maps app and specify some directional information. Once a route has been selected (Apple Maps will usually offer up to three routes to choose from), click the share button in the tool bar. There are a number of different ways of sharing directional information, and Apple Maps for OS X offers a lot more versatility than its iOS counterpart.
Send to iOS
The most well-known sharing feature of Apple Maps in OS X is the ability to send directions directly to your iOS device, provided it is signed into the same iCloud account as your Mac.
Selecting "Send to {Your iOS Device Name}" will send the directions to it and display a push notification on the lock screen. Swiping the notification will launch Maps and load the direction details within Maps, complete with the same route and full address information that was used.
For anyone planning a road trip or needing to find directions, it can be much easier to plan a route on the Mac than switching apps in iOS.
As Maps is available only on the Mac and iOS, you'd expect sending directions via email would only be useful to recipients who have the app. Sending direction information via email does indeed provide a link that launches Apple Maps on either OS X or iOS with the route information included, similar to the option of sharing it to an iOS device.
In addition to this link, Maps on OS X will also include a full PDF that contains a map of the route and destination, as well as an overview list of the turn-by-turn directions. While many Mac users will likely have an iOS device, it's a great way to provide route information to anyone.
AirDrop & iMessage
In addition to sending directions to iOS devices, you can also send directions via AirDrop (Mac only) or iMessage.
Using either of these services will launch Maps and automatically load the route, ready to start.
Facebook & Twitter
Maps also offers sharing functionality across these social networks, although rather more limited than email. Selecting either Facebook or Twitter will share a link that launches the direction information in Maps.
Recipients will need to be using a Mac or iOS device that uses Apple Maps. Additionally, it's probably not a good idea to share any directions to personal addresses over Facebook or Twitter. Although it does sound like a useful way of sharing directional information, these sharing options simply post either to your Facebook wall or Twitter timeline. There's no ability to send direct or private messages. If you're wanting to send some directions to your home, I strongly recommend avoiding either of these.