GNSS Compass can provide vertical heave position at four different points on a ship. The GNSS Compass heave filter is always on and fully automatic. After power on, GNSS Compass requires approximately 5 minutes for its heave filter to converge upon an accurate solution. Heave works without a GNSS fix, however best heave performance is achieved when GNSS Compass has a GNSS fix .

By default GNSS Compass provides heave from the point at which the GNSS Compass unit is mounted, however it can provide heave at four different offset points on the ship. To configure Heave, see the Configuration Menu page in the web UI or use the Reference Position Offsets dialogue in the GNSS Compass Manager.