Circular walk from Perranuthnoe and App testing January 22. 2017 Today we did a 4 mile circular walk from Perranuthnoe near Marazion on the south coast, along to Prussia Cove and back. I was testing my new "I walk Cornwall" App and comparing it to the GB outdoors A...[More] Tags: Cornwall . walk . walking app . St Michael's Mount . Perranuthnoe . Prussia Cove .