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7.10 Heave
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, use the
8.1.3
Configuration Menu page in the web UI or use the 8.2 Using GNSS Compass Manager .
7.11 Environmental Exposure
7.11.1 Temperature
GNSS Compass should not be subjected to temperatures outside of its operating range. Subjecting GNSS
Compass to temperatures outside of the operating range can affect the factory sensor calibration, potentially
causing a permanent reduction in performance or premature failure. For information about the operating
temperature range, see
5.2 Hardware Specifications .
7.11.2 Water
GNSS Compass complies with IP67 standard, which means that it can be submersed in water to a depth of up
to 1 m deep for a maximum of 30 minutes. Submersion to depths beyond 1 metre can cause water entry and
destruction of the internal electronics, and the sealing is not designed for prolonged or repetitive immersion. Do
not direct streams of water directly at the unit even at low pressure. For cleaning the unit, ensure that no
pressure is used.
Note : Connectors must be installed or blanking caps must be used if the unit is likely to be exposed to
water.
7.11.3 Salt
The GNSS Compass housing and stainless fittings to provide good corrosion resistance. The GNSS Compass
should be regularly rinsed with water when used in salt water environments.
7.11.4 Dirt and Dust
GNSS Compass is completely sealed against dirt and dust entry whenever all connectors are mated. When
disconnecting the connectors, any dirt or dust should be rinsed or wiped off with fresh water and then dried to
minimise the chance of contaminants entering the connectors or plugs.
7.11.5 pH Level
Environments with acidic or alkaline water or atmospheres can cause the GNSS Compass enclosure to corrode
or discolor. If GNSS Compass comes into contact with these environments it should be rinsed in fresh water as
soon as possible. It is not recommended to operate GNSS Compass in non-neutral pH environments.
7.11.6 Shocks
GNSS Compass is a rugged piece of equipment that can withstand reasonable amounts of shock. However,
continuous shocks may cause premature failure as a result of materials fatigue, and may also affect the sensor
calibration resulting in degraded performance.
v2.0 Page 36 04 Nov 2021
GNSS Compass Reference Manual • Using GNSS Compass