Tritech Gemini 1200ik, Product Manual

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0747-SOM-00004-01 Page 5 of 31
System Overview
The DMD system has been designed to provide divers with the ability to navigate and execute
inspections in zero visibility conditions.
Utilising the Gemini range of Multibeam imaging sonars allows the user to select the most suitable
sonar for the type of operation required. Employing a high degree of resolution and field of view the
diver can opt for either the Gemini 720ik or Gemini 1200ik Multibeam imaging sonars, both provide
excellent range, resolution and field of view. These high specification Multibeam imaging sonars
provide a diver with a high degree of confidence while working in zero visibility conditions and allow
searches to be undertaken far more efficiently than using conventional search pattern techniques.
The DMD systems have been designed to be used with the Inodive accessory rail system, allowing
for the DMD system to be used with an extensive range of dive masks and helmets. All of the Gemini
sonars, when supplied with a DMD system, are built-up with an Inodive interface to allow for
seamless installation onto the dive mask/helmet.
Power and control of the DMD system can either be through a tethered connection to the surface,
where the topside operator controls what the diver sees, or the diver can work autonomously with
no need for a surface connection by utilising a diver battery pack and DMD hand controller. The
tethered system (DMD-T) is intended primarily for surface air dive systems where the supplied tether
connects the diver to the surface and control of the sonar is undertaken by the support team. The
same DMD-
T system can be used by scuba divers, where it’s acceptable to be attached to the
surface by the tether. The untethered system (DMD-U) allows the diver to operate totally
independent of a surface connection, with the diver himself taking control of the sonar operation.
This is of particular benefit where a diver wishes to operate in a covert fashion or where there may
be hazards that the tether could get snagged on.
By using the DMD system, a diver has the ability to view the sonar image on the diver mounted
monocle, allowing the diver to quickly and efficiently locate targets of interest. The DMD-U system
allows the diver to adjust settings using a custom hand controller and record data of interest on the
subsea computer, while the DMD-T system allows the support diver on the surface to make any
necessary adjustments to the sonar settings and highlight any targets of interest for the diver to
investigate.
The Inodive rail system simplifies the fitting and removal of the DMD system. This allows the sonar
to be removed from the mask/helmet and attached to a Gemini sonar pistol grip where this may at
times offer some advantage, such as difficult to reach areas or where a different sonar viewing angle
may be beneficial. The innovative Monocle design allows for it to be accurately positioned on the
divers helmet/mask and yet it can also easily be lifted out of the divers view and later replaced back
into the same position
by the diver when it’s required.