Downloading SeaNav US 2.11.1 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. The software lies within Lifestyle Tools, more precisely Sports.
This Mac application was originally developed by Pocket Mariner Ltd. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software.
From the developer:
SeaNav US lets you explore and plan your boating trips on your Mac. You can export your route to your iPhone for navigation while at sea, or plug in a GPS unit and navigate with your laptop and hi-res vector charts. SeaNav lets you measure distances and bearings and record waypoints on routes.
You may want to check out more Mac applications, such as SerieFoot, almost.at or Mini Ramp, which might be similar to SeaNav US.