If you’re headed to a location where you’re not sure of the cell reception, sending a Map to your iPhone or iPad from Mavericks is obviously of little use.
If you need to get a PDF of a section of the map so you can print it out, or just send it to your iPhone for offline access, it’s fairly simple. Like any other app on Mac OS X, you can print Maps using the standard dialog, or–with Maps in Mavericks–you can simply export to PDF.