There is a lot of space-equipment aboard the SIBIR’, and they expect 
soon to be able to give Pravda's editorial office information via 
the satellite MOLNIA. 
On May 31. the ice-convoy (SIBIR' and KAPITAN MYSJEVSKIY) is 
nearing the northern point of Novaya Zemlya, Mys Zhelaniya. Then 
the satellite "EKRAN" was used for relaying transmissions to the 
convoy. 
4.6 Laser Terrain Profiles of Sea Ice SurfaceS 
  
During the last half of the sixties, the U.S. Naval Oceanographic 
Office (NAVOCEANO) conducted airborne experiments over the Arctic 
pack ice to evaluate the usefulness of various remote sensor systems 
for mapping and measuring sea ice conditions and features. Infrared 
scanners, side-looking radar, a passive microwave imager, and a 
laser altimeter terrain profiling system were used. 
At the above-mentioned experiment over the sea-ice fields of the 
Beaufort Sea in April 1968, also a laser terrain profiler was 
tested. Analysis of the data revealed that sea ice surface rough- 
ness and the naturé of the roughness and relative surface reflec- 
tivities can be used to interpret the categorical stages of ice 
development. 
The laser terrain profiler seemingly detected, with acceptable 
accuracy, all ice features traversed. Ice pressure ridges, ice 
hummocks, or ice blocks could not, however, be discriminated from 
each other on the record since the measurement is only two-dimen- 
sional. These features were always detectable even when occuring 
in rapid succession. Cracks were very discernible on the laser 
terrain profile record. According to an informal NAVOCEANO-report 
of May 1970, entitled "Preliminary Analysis of Laser Terrain Profiles 
of Sea Ice Surfaces", by Robert D. Ketchum, Jr., the laser profile 
data obtained with coincident photography from an altitude of 
about 300 metres (1,000 feet) over the sea ice indicated that