Triton Perspective - Manual (Page 107)

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If the cast has both Up and Down components then these are displayed as dark blue ‘Down’
and lighter blue ‘Up’.
Sample from:
There are choices to use either the 'Upcast', the 'Downcast' or the 'Merged' value from both.
Velocity sampling:
Choose whether to use the 'Mid-Sample' value or the actual 'Sample'.
Refraction at transducer depth from:
Off: Use the value supplied by the sonar head sensor.
CTD: Use the value supplied by an external CTD sensor and logged in the XTF file as Sound
Velocity.
SVP: Use the information read from the SVP graph for transducer depth.
Hit 'Next' to continue to the Tide/Squat Processing Dialog.