Please ensure that you have installed the Prolific driver correctly for El Capitan.
See this article on the Navigation Mac website:
Installing Prolific driver in El Capitan
Also, contact the new developers of iNavX and MacENC by clicking the Support tab on the new iNavX website:
iNavX.com
See this article on the Navigation Mac website:
Installing Prolific driver in El Capitan
Also, contact the new developers of iNavX and MacENC by clicking the Support tab on the new iNavX website:
iNavX.com
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Jon Longworth
Jon Longworth