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ERDC TN-DOER-I6
March 2001
instrumentation subcontractors and consulting engineers also reviewed the specifications and
provided technical guidance. Detailed information about the SI contract specification guide can
be obtained from SI points of contact provided at the end of this document.
Because dredging contract requirements vary between Corps Districts, each District can tailor
the SI contract specifications to meet its specific dredging needs.  In addition, these
specifications may differ from contract to contract within a District if different types of dredging
are required. However, one of the main purposes of the SI system is to standardize the
monitoring requirements so that a contractor's dredge may work for various Corps Districts with
a minimum amount of SI system modifications to meet disparate monitoring requirements. The
SI specifications are included in dredging contract bid packages distributed by the District.
In general, the SI contract specifications for hopper and pipeline dredges include details related
to the following topics:
DPIP requirements
Contractor-provided sensor and data requirements
-
Type, number, and locations
-
Quality control criteria
-
Minimum data performance requirements
-
Data reporting and format
-
Reference datum(s)
Contractor-provided computer equipment
Data-reporting interface requirements
Quality assurance test descriptions and requirements (predredging and during dredging)
Table of contractor-specific deliverables
DPIP submittal schedule
Data format examples and related definitions
One of the most important elements of the SI specifications is the format in which the SI data are
reported. The SI system has extended the National Marine Electronics Association (NMEA)
format commonly used by many instruments aboard dredges (NMEA 1998). The purpose of this
extended format is to provide a standardized data interface between the DSS and Ship Server for
all SI system measurements. The general data format for the SI system interface is given as
follows:
$Paaa,LABEL,x.x-----------------------------,*hh<CR><LF>
where
= Proprietary sentence identifier
$P
= Three-letter manufacturer's mnemonic code
aaa
4

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