Sentinel V SC and RT Operation Manual
September
2017
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Page 211
Example
The Sentinel V Real-Time is mounted in place on a moving ship. Beam 3 has been rotated
45 clockwise (+45) from the ship’s centerline. Use the EA command to tell the Sentinel V
Real-Time where beam 3 is in relation to the ship’s centerline. To c45 to an EA-
command value, multiply the desired alignment angle in degrees by 100:
EA = +45.00 × 100 = +4500 = EA+04500
EB – Heading Bias
Purpose
Corrects for electrical/magnetic bias between the Sentinel V Real-Time heading value and
the heading reference.
Format
EB±nnnnn
Range
±nnnnn = -17999 to 18000 (-179.99 to 180.00 degrees)
Default
EB00000
Recommended Setting. Set using the magnetic variation setting in Plan.
Description EB is the heading angle that counteracts the electrical bias or magnetic declination between
the Sentinel V Real-Time and the heading source. Use the EA-command to correct for
physical heading misalignment between the Sentinel V Real-Time and a vessel’s centerline.
Examples
A Sentinel V Real-Time is receiving heading from its internal compass. A navigation map
for the deployment area shows a declination of 10°10
′
W 1995 (9
′
E/year). This means the
magnetic offset in the year 2001 at this location is (- (10+10/60) + (9/60*6)) = -9.26666
degrees. Set the EB command value to EB-926.
EC – Speed of Sound
Purpose
Sets the speed of sound value used for Sentinel V Real-Time data processing.
Format
ECnnnn
Range
nnnn = 1400 to 1600 meters per second
Default
EC 1500
Recommended Setting. The default setting for this command is recommended for most applications.
Description EC sets the sound speed value used by the Sentinel V Real-Time to scale velocity data,
depth cell size, and range to the bottom. The Sentinel V Real-Time assumes the speed of
sound reading is taken at the transducer head. See the primer for information on speed of
sound calculations.
If the EZ Speed of Sound field = 0, the Sentinel V Real-Time overrides the manually-set EC
value and calculates speed of sound using the values determined by transducer depth (ED),
salinity (ES), and transducer temperature (ET). EZ also selects the source for ED, ES, and ET.
