HD-MAX Echo Sounder User Guide
109
transmission delay. During daily operations, the methods to effectively
reduce cable transmission delay include:
Method I: Only positioning data and time information will be output from
GPS through sending mainboard command. It will effectively reduce the
amount of data transferred from serial port thus to reduce the delay.
Method 2: Try to get the GPS antenna installation position closer to
measurement position as far as possible to reduce the length of
GPS
antenna cable thus to reduce the delay.
Method 3: Choose the coarser transmission cables since the resistance of
coarser transmission is smaller with shorter transmission delay.
Since during actual measurement, the users take different GPS motherboards
and cablesis different, therefore, GPS delay time are different as well. At
present, the best solution is to introduce hard synchronized PPS during the
measuring process thus to effectively eliminate GPS data delay.
Survey line size: To set the size of each survey line document, If the
document size of current survey line exceeds the value, the software will
automatically create a new line file to continue recording.
Display parameters
Figure 13-14 Display parameters
(1) Color of sounding points
There are three color modes optional:
①
Monochromatic mode: Adopt the same kind of color display for all
sounding points.
②
Double color mode: The sounding value less than separating sounding
value presents as light color. And those greater than the boundary depth value
present as dark color.
