© Valeport Limited 2003
MIDAS Surveyor Operating Manual
Page 15
0420805d.doc
4.2.3.3
Set Ident No.
Each data file may be assigned an Identification Number to aid data interpretation. Use the up and down keys to scroll
from 0 to 99, and Enter to confirm. The chosen Ident Number will be applied to all subsequent data files, until it is
changed again.
4.2.3.4
Log Parameters
As well as the basic parameters of depth and position, the MIDAS Surveyor will also accept data inputs from other
devices. In particular, Heave and Tide data inputs can be used to provide corrective information for the Depth data. The
MIDAS Surveyor is capable of performing these corrections in real time, so that only true depth values are displayed and
logged. This feature is actually turned on/off in the echosounder setup menu system (see Section 4.2.9.9). The Log
Parameters feature simply allows the user to determine which of the Depth / Heave / Tide data inputs are to be recorded;
for example, it may be decided that if corrected data is logged, there is no need to keep a record of what those corrective
Heave and Tide values were. The following combinations are possible:
If Real Time correction is ON
CORR.ONLY
Corrected Depth value only
CORR+HEAVE
Corrected Depth value and Heave input
COR+HVE+TID
Corrected Depth value, together with Heave and Tide values.
CORR+TIDE
Corrected Depth value and Tide input
If Real Time correction is OFF
RAW ONLY
Uncorrected Depth value only
RAW+ HEAVE
Uncorrected Depth value and Heave input
RAW+HVE+TID
Uncorrected Depth value, together with Heave and Tide values.
RAW+ TIDE
Uncorrected Depth value and Tide input
In all cases, use up and down to scroll through the available options, and Enter to confirm.
The Log Parameters function may only be altered if Logging is OFF.
4.2.3.5
Sound Velocity Interval
The MIDAS Surveyor will accept a real time input from a Valeport Sound Velocity sensor. Whilst this input is not used to
provide real time correction of the Depth data, it may be useful in post processing functions. Data from these sensors is
at variable rates, from 16Hz to 1Hz; the user may decide that logging of all these data points is unnecessary. The "SVEL
interval" function allows only selected data points from this sensor to be logged to memory.
Use up and down arrows to scroll through the logging interval in 1 second increments, from OFF through to 300 seconds
(5 minutes), and Enter to confirm. Note that the instrument will log the last measured data point at the set interval. The
display will continue to show data at the rate at which it is received.
