UNCLASSIFIED 



Security Classification 



<EY WORDS 



Very Low Frequencies 



Phase-Difference Measurements 



Omega Navigation System 



NAVADO 



Oceanographic Surveys 



HMS VIDAL 



HR. MS. SNELLIUS 



and addi 



all 



ntee, Department of De- 

 ense activity or other organization (corporate author) issuin 

 he report. 

 la. REPORT SECUraXY CLASSIFICATION: Enter the over 



urity classification of the report. Indicate whether 

 "Restricted Data" is included. Marking is to be in accord- 

 ance with appropriate security regulations. 



2b. GROUP: Automatic downgrading is specified in DoD Di 

 rective 5200.10 and Armed Forces Industrial Manual. Enter 

 the group number. Also, when applicable, show that optlona 

 markings have been used for Group 3 and Group 4 as author- 



INSTRUCTIONS 



imposed by security cla 



3. REPORT TITLE: Enter the complete report title in all 

 capital letters. Titles in all cases should be unclassified. 

 If a meaningful title cannot be selected without classifica- 

 tion, show title classification in all capitals in parenthesis 

 immediately following the title. 



4. DESCRIPTIVE NOTES: If appropriate, enter the type of 

 report, e.g., interim, progress, summary, annual, or final. 

 Give the inclusive dates when a specific reporting period is 



5. AUTHOR(S): Enter the nameCs) of author<s) as shown on 

 or in the report. Entei last name, first name, middle initial. 

 If military, show rank and branch of service. The name of 

 the principal author is an absolute minimum requirement. 



6. REPORT DATE; Enter the date of the report as day, 

 month, year; or month, year. If more than one date appears 

 on the report, use date of publication. 



I page . 



7a. TOTAL NUMBER OF PAGES: The 

 should follow normal pagination proceduj 

 number of pages containing information. 



76. NUMBER OF REFERENCES: Entei 



references cited in the report. 



8j. CONTRACT OR GRANT NUMBER: If appropriate, 



the applicable number of the contract or grant under wh: 



the report was written- 



86, 8c, St 8d. PROJECT NUMBER: Ent 



military department identification, such 



subproject number, system numbers, tasl 



9a. ORIGINATOR'S REPORT NUMBER(S): Enter the 



cial report number by which the document will be iden 



and controlled by the originating activity. This numb' 



be unique to this report. 



96. OTHER REPORT NUMBER(S): If the report has 



assigned any other report numbers (either by the origi 



or by the sponsor), also enter this number(s). 



10. AVAILABILITY/LIMITATION NOTICES: Enter 

 itations on further dissemination of the report, other t 



he 



the total number of 



the appropriatf 

 project numbe 

 umber, etc. 



n, using standard 



ay obtain copies of th: 



"Qualified request* 



report from DDC " 



"Foreign announcement and dissemination of this 



report by DDC is not authorized." 



"U. S. Government agencies may obtain copies of 



this report directly from DDC. Other qualified DDC 



users shall request through 



"U. S. military agencies may obtain copies of this 

 report directly from DDC. Other qualified users 

 shall request through 



"All distribution of this report is controlled. Qual- 

 ified DDC users shall request through 



If the report has been furnished to the Office of Technical 

 Services, Department of Commerce, for sale to the public, indi- 

 cate this fact and enter the price, if known. 



11. SUPPLEMENTARY NOTES: Use for additional explana- 

 tory notes, 



12. SPONSORING MILITARY ACTIVITY: Enter the name of 

 the departmental project office or laboratory sponsoring (pay- 

 ing for) the research and development. Include address. 



13. ABSTRACT: Enter an abstract giving a brief and factual 

 summary of the document indicative of the report, even though 

 it may also appear elsewhere in the body of the technical re- 

 port. If additional space is required, a continuation sheet shal! 

 be attached. 



It is highly desirable that the abstract of classified r 

 unclassified. Each paragraph of the abstract shall enc 

 indication of the military security classification of the 

 rmation in the paragraph, represented as (TS). (S). (C). ■ 



There is no limitation on the length of the abstract, 

 er, the suggested length is from 150 to 225 words. 



! ports 

 with 



14. KEY WORDS: Key words s 

 or short phrases that characteri 

 index entries for cataloging the 



echn 



ally 1 



■ that : 



■ity da 



epor! 



nodel designation 

 ? name, geographic location, ma 

 ill be followed by an indication 

 ssignment of links, roles, and v 



UNCLASSIFIED 



