Even with "Navi" active, you must watch out for:
For privateers (PvP players), GVO Navi has a "PvP Layer" showing: gvo navi
Note: This relies on user reports. It is not real-time tracking of other players. Even with "Navi" active, you must watch out
This is a heated debate in the GVO community. Note: This relies on user reports
The Official Stance: Koei Tecmo (the developer) has historically not banned players for using GVO Navi, provided it does not send keystrokes (auto-sailing) or modify game files (DLL injection). Since GVO Navi is a memory reader (Read-Only), it is generally considered a "QOL tool" (Quality of Life).