Artemis BP00707, Руководство пользователя

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6 DIVING ARTEMIS
Before diving with the Artemis console, please familiarise yourself will all aspects of the
systems operation, as described in this manual.
6.1 Pre-Dive Checklist
Prior to a dive with the Artemis Console, please check all of the following actions have
been completed...
 There is enough free space on the internal storage for the Dive-Log file – allow
approximately 2Mb of storage space per minute of the dive.
 Any Mission file to be used has enough free “marker” slots to allow the diver to
define any in-mission markers if required.
 Battery pack is fully charged ( )
 Battery housing cap is tight and sealed.
 Blanking plugs have been fitted to all unused connectors (Serial and USB) to
prevent water ingress.
 If the Sonar is to be used, check the Sonar status icon ( ) on the Artemis Display
status bar is visible and white (red indicates no Sonar connected, yellow indicated
invalid data).
 If the GPS Float is to be used, check the GPS status icon ( ) on the Artemis Display
status bar is visible and white (red indicates no GPS connected, yellow indicates
data, but not GPS fix determined).
6.2 Summary of Sonar Operation
The following points summarise the operation of the sonar (for further details, see
page 60) …
 Hold the sonar horizontally and stationary for a few seconds while a full scan
completes. Moving the sonar during a scan will smear or distort the imagery.
 Only targets illuminated by the sonar beam can be seen – 35° in the vertical plane,
3° in the horizontal plane, scanning through a 90° arc.
With the sonar angled horizontally, this means targets above and below the
operator by approximately 17° degrees may not be seen.
 The polar sonar display shows “top-down” type display of the echoes received from
the targets leading edges.
 Targets cast acoustic shadows, which may obscure all or parts of targets behind
them.
 Dense or gaseous targets appear brightest on the display, while mud and silt will
appear very dull.
 As no vertical information is available, vertically aligned or overlapping targets in
the sonar beam will merge into a single echo.
 Use the gain control to reduce the background noise reflections in a high clutter
(rocky/boulder) environment.
When scrutinizing a target at close range (within 3m range) in turbid or nil visibility,
the gain is particularly useful in establishing the shape, constitution and dimensions
of the target being prosecuted.