Installed Oracle Virtualbox on Ubuntu 14.04 (Trusty) and set up a Windows 8.1 guest. During the installation
of Win 8.1 it is best not to press any buttons to speed up the process e.g. when it says 'Restart Now'. Let the install continue unaided.
You need to install the Extensions Pack to get access to a USB and need to make sure that the 'VBoxUsers' group is added to your account.
The VisitMyHarbour USB chart stick is recognised by the Windows guest and the security
program runs. After 'I accept' you get access to the VMH charts for OpenCPN.
OpenCPN runs fine in Virtualbox and shows the VMH charts. It was not possible to access the VMH charts from the host system (Ubuntu).
The latest VMH chart stick will not run on Windows XP.