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

Base station radio modem RTK corrections require two additional pieces of hardware,
these are the base station and the radio modem receiver. The base station is setup at
a fixed location and transmits corrections to the radio modem receiver that is
connected to the mobile Spatial FOG Dual unit. The radio modem receiver and Spatial
FOG Dual unit must remain within range of the base station to receive these
corrections, typically this range is approximately 20km. Advanced Navigation
recommends the Trimble R4 base station combined with the Trimble TDL 450L radio
modem. Please contact your local Trimble dealer for more information and pricing.
10.14

Heave

Spatial FOG Dual can provide vertical heave position at four different points on a ship.
Spatial FOG Dual's heave filter is always on and fully automatic. After power on,
Spatial FOG 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 FOG Dual has a GNSS fix.
By default Spatial FOG Dual provides heave from the point at which the Spatial FOG
Dual 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 FOG Manager, see section 11.8.9.
10.15

Environmental Exposure

Whilst Spatial FOG Dual is environmentally protected, there are clearly defined limits
to this protection that must be adhered to for reliable operation.
Spatial FOG Dual is only protected when it's connector is mated, an IP67 SMA GNSS
antenna is attached and a pressure hose connected to the static port. When any of
these connections are not made the unit offers no environmental protection.
Spanners or tools should never be used to tighten the connectors. They should only
ever be finger tight.
10.15.1

Temperature

Spatial FOG Dual should not be subjected to temperature's outside of it's operating
range. Subjecting Spatial FOG Dual to temperature's outside of the storage range can
cause failure of the system.
10.15.2

Water

Spatial FOG Dual is water-proof to the IP68 standard which means that it can be
submersed in water to a depth of up to 2 metres only. Submersion to depths beyond 2
metres can cause water entry and destruction of the internal electronics.
10.15.3

Salt

Spatial FOG Dual is made from marine grade aluminium which gives it reasonably
good salt water corrosion resistance. However Spatial FOG Dual cannot tolerate
extended periods of time in salt water environments. After any contact with salt water
environments, Spatial FOG Dual should be thoroughly rinsed with fresh water.
Spatial FOG Dual Reference Manual
Page 46 of 138
Version 1.0
26/06/2015