Use Help->Check for Software Update to get the newest version, HomePort 2.2.3.
The primary difference from HomePort 2.2.1 is that the program keeps you logged in to Active Captain when you disconnect your wireless connection. The previous version, 2.2.1, would sometimes log you out.
The features added in HomePort 2.2.1 was the ability to show ActiveCaptain markers in the map and the ability to play back Recorded Sonar Data.
