852-GS Ultra-Miniature Imaging Sonar
Doc No: 430-048-0B
Page
27
of
34
3.4.6.
System => Sonar Type
RealTime only
Selects one of various models of sonar supported by Win881AL. Select
852-GS/ES
.
3.5.
OPTIONS
3.5.1.
Options => Units
Meters (default) or feet can be selected as the units used.
3.5.2.
Options => Measure Target
Measures distance in meter
s or feet (depending on “
Options => Units
” selection) on the display.
3.5.3.
Options => RealTime Play Speed
Playback only.
Limits the playback speed to the same speed as what was used when data was acquired.
3.5.4.
Options => Enable Gyro
RealTime only
Enables the internal gyro to be used in North Up, Heading Up, Target Steering and Acquire Target mode.
3.5.5.
Options => Calibrate Gyro
RealTime only
All gyros are sensitive to the environment (i.e. temperature, motion, earth's rotation, etc.) and will naturally drift
with time. Therefore, from time to time it is recommended to complete a gyro calibration (in manual mode) or
re-calibrate the motor (in gyro auto mode) to remove the accumulated drift.
Automatic Gyro Calibration
Imagenex gyro enabled scanning sonars now incorporate an automatic gyro biasing feature. This mode
continuously re-biases the gyro in real time accommodating for temperature fluctuations and internal drift. See
Section 3.5.6 Options => Enable Gyro Auto Bias for enabling / disabling this mode. When first starting the
sonar, the bias adjustment will be very rapid as the temperature stabilizes. While the gyro will still internally
