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

10.15

Heave

Spatial Dual can provide vertical heave position at four different points on a ship.
Spatial Dual's heave filter is always on and fully automatic. After power on, Spatial
Dual requires approximately 5 minutes for it's heave filter to converge upon an
accurate solution. Heave works without a GNSS fix, however best heave performance
is achieved when Spatial Dual has a GNSS fix.
By default Spatial Dual provides heave from the point at which the Spatial Dual unit is
mounted, however it can provide heave at four different offset points on the ship. To
set the heave offsets use the heave configuration dialogue in Spatial Dual Manager.
10.16

Environmental Exposure

Whilst Spatial Dual is environmentally protected, there are clearly defined limits to this
protection that must be adhered to for reliable operation.
Spatial Dual is only protected when it's connector is mated and two IP67 SMA GNSS
antennas are attached to it. When any of these three 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.
10.16.1

Temperature

Spatial Dual should not be subjected to temperature's outside of it's operating range.
If the temperature rises above 90 degrees Celsius, Spatial Dual will automatically shut
off power to it's sensors and GNSS in an attempt to prevent damage, this will also
send the filters into reset. Subjecting Spatial Dual to temperature's outside of the
storage range can effect the factory sensor calibration which will cause a permanent
performance degradation.
10.16.2

Water

Spatial Dual 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.
10.16.3

Salt

Spatial Dual is made from marine grade aluminium which gives it reasonably good salt
water corrosion resistance. However Spatial Dual cannot tolerate extended periods of
time in salt water environments. After any contact with salt water environments,
Spatial Dual should be thoroughly rinsed with fresh water.
Spatial Dual Reference Manual
Page 50 of 137
Version 2.3
12/04/2016