36 
Part D - Minimum requirements on site investigations 
Methods 
• Multi-Beam Echosounder, MBES; data 
density sufficient to generate a digital 
terrain model with a resolution of at 
least 1 m 
• Positioning of the ship and the firmly 
installed sensors as well as the accu 
racy for reduced depths modelled on 
IHO (2008) for Special Order Surveys 
• Side scan sonar with a frequency of 
100 kHz or higher, measuring area 
max. 2 x 100 m, recognition of objects 
> 0.5 m grid spacing; digital recording, 
cruising speed chosen such that the 
area is fully covered; positioning of the 
device is better than 10 cm 
• Subbottom profiler, chirp sonar or alter 
native systems with comparable or bet 
ter performance; vertical resolution of 
at least 0.5 m 
• Vibrocorer or cone penetration testing 
up until the planned installation depth 
of the cable, intervals are established 
on the basis of geophysical findings 
• Magnetometer or an active metal de 
tection system 
• Thermal conductivity measurements in 
the cable route corridor area, within 
which cable operations are affected to 
low thermal conductivity of the seabed. 
• Multi-Beam Echosounder, MBES; data 
density sufficient to generate a digital 
terrain model with a resolution of at 
least 1 m 
• Positioning of the ship and the fixedly 
installed sensors as well as the accu 
racy for reduced depths modelled on 
IHO (2008) for Special Order Surveys 
• Side scan sonar with a frequency of 
100 kHz or higher, measuring area 
max. 2 x 100 m, recognition of objects 
> 0.5 grid spacing; digital recording, 
cruising speed chosen such that the 
area is fully covered; positioning of the 
device is better than 10 m 
Presentation 
of results 
• Cartographical illustration of all findings 
of measurements in an integrated for 
mat in alignment charts (horizontal 
scale 1 : 5000, vertical scale 1 : 100 or 
1 : 150) 
• The presentation of all measuring 
results in a report in an integrated for 
mat; maps and reports should usefully 
supplement each other and make 
reference to each other where neces 
sary; documentation of equipment 
used, time and course of measuring, 
measuring conditions, problems etc. 
shall all be recorded in the report 
• Special maps for landings and cable 
and pipeline intersections 
• Maps must also be in GIS or CAD for 
mat 
• Cartographical illustration of all findings 
of measurements in an integrated 
format in alignment charts (horizontal 
scale 1 : 5000, vertical scale 1 : 100 or 
1 : 150) 
• Illustration of all measurement results in 
a report in integrated format. Maps and 
reports should usefully supplement 
each other and make reference to each 
other. Documentation of equipment 
used, time and course of measuring, 
measuring conditions, problems etc. 
shall all be recorded in the report 
• Maps must also be in GIS or CAD 
format