SURFACE NAVIGATION AND BUOY LOCATION TRANSPONDER 
Sketchs 
(To be provided) 
Primary Uses 
To be utilized on oceanographic survey ships during miscellaneous 
oceanographic operations for three purposes: (1) To permit seaward 
extension of existing shore navigation control stations in certain 
areas designated for specific survey assignments (hydrographic-oceano- 
graphic), (2) To aid in the location and "homing in" on deep-sea 
anchored buoys and/or other devices, and (3) To provide a system for 
establishing reference grids in extended ocean areas lacking electronic 
navigational aids for conducting special research and/or survey opera- 
tions. 
Requirements and Specifications: 
a. Buoy-Mounted Transceiver Unit: 
(1) Transceiver unit to be mountable on various size buoys and 
at a sufficient height above the surface of the water so as to permit 
maximum range performance. 
(2) To consist of a low-powered transceiver unit which would be 
activated by the servicing ship's interrogation pulse and then transmit 
a signal back automatically on the same frequency. The transceiver 
should be transitorized, compact, light-weight, rugged, and provide for 
reliable unattended operation. 
(3) Transceiver should be designed so that it can be activated, 
if possible, by existing survey/research surface ship's radar/radio 
systems and also by existing aircraft systems which might be utilized 
in oceanographic investigations and surveys. In brief, it should be 
capable of being attuned to and broadcast back on a pre-selected fre- 
quency band. 
(4) Transceiver unit should contain its own power supply and 
this should have an assured 6-12 month life unattended, in this inter- 
mittent type of interrogation. 
(5) Transceiver unit to shut down automatically when interroga- 
tion has ceased. 
(6) Transceiver to perform reliably at ranges varying from 10-50 
miles. 
b. Shipboard/Airborne Transceiver Units 
(1) The instrument to be designed for operation from either an 
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