Translation 2783

314
Average draught when fully loaded
1.08 metres
Displacement when fully loaded
718 tons
Deadweight ...... .. 296 tons
Capacity of holds .
207 eu. metres
Uegistered gross capacity
344 reg. tons
Type -and size of ship's principal power
installation: diesel
300 h.p.
Top speed when loaded
9 knots
Total power of electric plant
63 kw.
Peried of independent voyaging
37 daYs
Accommodation for crew of 26
AERIAL SURVEYING OF SEAL ROOKERIES
. Aeroplanes began to be used for aerial surveying of marine
mammals in the North in 1925, An aerial survey was first carried
out in the Far East in 1950, by S. V. Dorofeev in the Sea of Okhotsk.
• When the use of aviation for surveys of marine mammals began, the
types of aeroplanes used were "ShA", "Star-2", and "P0-2"5 now we
use "AN-2", "DI-2", and "IL-14" aeroplanes, and helicopters.
The principal function of aerial surveying is to locate the
larest concentrations of animals and to notifysealing vessels of
the co-ordinates of a rookery, its area, its population density,
and the most accessible route for approaching it,
Aerial surveys are classified as prospecting and operational.
A prospecting survey begins before the ships set out to hunt seals,
du -ring the process of rookery-formation. The aim of such surveys
is not merely to locate rookeries but also to find out about ice
conditions. The findings of the prospecting survey make it possible
to fix the date when the ships will set out and the area in which
they will operate. Operational surveys begin after the skis
arrive in the area of operations.
In the White Sea an aeroplane constantly observes ice
conditions, the existence of open water, and the movement of driftice
with discovered rookeries- All of these data are transmitted
to the sealing vessels.
Durin thc Jle:iod of mass T'upping the aeropine should not
fly lower tIlar 800 motres. When puppine is completed the surveys
:Aay be made at a lower altitude (down to 300 metres), because a