
April
2018
Pathfinder DVL Guide
Page 108
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Table 21:
Water-Mass Reference-Layer Modes
Command
Description
#BK0
Disables the water-mass layer ping.
#BK1
Sends a water-mass layer ping after every bottom-track ping
#BK2
Sends a water-mass layer ping after every bottom-track ping that is unable to find the bot-
tom.
#BK3
Disables the bottom-track ping and enables the water-mass ping.
#BL - Water-Mass Layer Parameters
Purpose
Sets bottom-track water-mass layer boundaries and minimum layer size.
Format
#BLmmm,nnnn,ffff
The BL commands work with or without the # sign. For example, using BL or #BL are both
valid commands.
Range
mmm = Min Layer Size (
1 to 640 decimeters
) [meters x 10]
nnnn = Near Layer Boundary (0 to 9999 decimeters) [meters x 10]
ffff = Far Layer Boundary (0 to 9999 decimeters) [meters x 10]
In addition, the following must be true:
Far >= (Near + Min)
The Far boundary cannot exceed 80% of the range-to-bottom of the beam with the short-
est altitude. If the bottom comes up so that the Far boundary does not meet this require-
ment, then the Far boundary is automatically adjusted to ensure this requirement is met,
unless the minimum layer size cannot be maintained, in which case the water track ping
is skipped and the data is marked bad.
Default
#BL80,160,240
The default setting for this command is recommended for most applications.
Description
The #BL-command sets a water-mass layer. Use this layer as a reference point when the
bottom is out of range or is incorrect. Water-mass layer output data are available when
both #BK (see
) commands are nonzero values, and the bottom must be at least the Minimum
Layer Size + Near Layer Bo 20% of the reported depth away from the trans-
ducer. The Far Layer Boundary (ffff) must be less than the maximum profiling distance or
the Pathfinder sends Error Code 011.
For more information, see