Heave; Environmental Exposure; Temperature; Water - Advanced Navigation Spatial Reference Manual

detect and exclude both faulty and fraudulent satellite signals. Spatial's internal GNSS
is equipped with RAIM and it is enabled by default.
10.17

Heave

Spatial can provide vertical heave position at four different points on a ship. Spatial's
heave filter is always on and fully automatic. After power on, Spatial 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
Spatial has a GNSS fix.
By default Spatial provides heave from the point at which the Spatial unit is mounted,
however it can provide heave at four different offset points on the ship. To set the
heave offsets, either use the heave configuration dialogue in Spatial Manager, see
section 11.8.10.
10.18

Environmental Exposure

Whilst Spatial is environmentally protected, there are clearly defined limits to this
protection that must be adhered to for reliable operation.
Spatial is only protected when its connector is mated and an IP67 SMA GNSS antenna
is attached to it. When either of these two connections are not finger tightly closed the
unit offers no environmental protection.
Spanners or tools should never be used to tighten the connectors. They should only
ever be finger tight.
10.18.1

Temperature

Spatial should not be subjected to temperatures outside of its operating range. If the
temperature rises above 90 degrees Celsius, Spatial will automatically shut off power
to its sensors and GNSS in an attempt to prevent damage, this will also send the filters
into reset. Subjecting Spatial to temperature's outside of the storage range can effect
the factory sensor calibration which will cause a permanent performance degradation.
10.18.2

Water

Spatial is water-proof to the IP67 standard which means that it can be submersed in
water to a depth of up to 1 metre only. Submersion to depths beyond 1 metre can
cause water entry and destruction of the internal electronics.
10.18.3

Salt

Spatial is made from marine grade aluminium which gives it reasonably good salt
water corrosion resistance. However Spatial cannot tolerate extended periods of time
in salt water environments. After any contact with salt water environments, Spatial
should be thoroughly rinsed with fresh water.
10.18.4

Dirt and Dust

Spatial is completely sealed against dirt and dust entry. It is important to note that this
Spatial Reference Manual
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Version 4.4
04/06/2019