vmAIS 3.6 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The program is categorized as System Tools. We recommend checking the downloaded files with any free antivirus. This free Mac app is an intellectual property of Vesper Marine Ltd.
From the developer:
vmAIS is an installation and configuration tool for your Vesper Marine AIS transponder. It enables you to connect to your AIS transponder over USB or WiFi, so you can configure your Vessel's AIS Static Data, view your AIS Transponder's own GPS position, position accuracy, course, and speed, configure GPS smoothing, fast updates, SBAS control, and check the operational status of your AIS Transponder.
You may want to check out more Mac applications, such as PodManager, iPhoneDisk or SpaceReporter, which might be related to vmAIS.