12-02-10 Survey on GPS lacks of availabitily
IFN has created a working group on the improvement of positioning at sea, called "e-Positioning".
In this frame, it has been deemed necessary to list the recent occurrences (since beginning of 2010) of GPS system unavailability identified by operational users.
To that end, a questionnaire has ben sent to professionnals of maritime navigation.
IFN membres who want to upload 
the questionnaire may click  here after loggin in.