1542 HYDROGRAPHIC MANUAL PaGE 40 



Prior to the assignment of registry numbers, the field designation shall be used to 

 refer to a survey in all correspondence and reports relating to it, and on all applicable 

 progress sketches and sheet layouts. The field number shall be shown in one or more 

 places on the back of each sheet when it is forwarded to the Washington Office (see 

 3213 and 793). 



For surveys of the Philippine Islands, registry numbers are assigned by the Manila 

 Office at the time a project is planned and there is, therefore, no need for the use of 

 field numbers. 



1542. Assignment of Registry Numbers 



Each season, as soon as it can be ascertained with reasonable certainty, the Chief 

 of Party shall request from the Washington Office the assignment of registry numbers 

 to the hydrographic and topographic surveys that will be completed during the current 

 season. A registry number will then be assigned for each field number. Such a 

 number consists now of four digits preceded by the capital letter H- or T- identifying it 

 as a hydrographic or topographic survey. These numbers have no geographic or cal- 

 endar significance. Numbers should not be requested for surveys which have been 

 started, but of which there is some doubt as to their completion during the season. 



Topographic surveys made on both sides of aluminum-mounted sheets should be 

 definitely identified on the list requested, as each sheet is assigned one registry number, 

 its two sides being identified by sub-a and -h letters. Topographic surveys made on 

 Whatman's paper should also be identified on the list as they are assigned numbers 

 from a different series than that used for aluminum-mounted sheets. 



The request for registry numbers should be accompanied by a complete sheet lay- 

 out diagram showing the field numbers, unless such layout has been shown on the 

 monthly progress sketch. The diagram should be made in black ink so that photo- 

 graphic copies may be made, 



1543. Use of Registry Numbers 



After a registry number is known, it shall be used in lieu of the field number in all 

 correspondence, reports, etc. The registry number shall be clearly shown in one or 

 more places on the back of the boat sheet and smooth sheet (see 3213 and 793), when 

 they are transmitted to the Washington Office. It shall likewise be shown in the appro- 

 priate space on every record relating to the survey. In all correspondence and in the 

 text of all Descriptive Reports, etc., each reference to registered hydrographic and 

 topographic surveys shall include the year of the survey in parentheses after the registry 

 number, thus: H-6381(1939). 



When hydrographic and topographic surveys are received and registered in the 

 archives in the Washington Office, the registry number is stamped prominently on the 

 back of each sheet in all four corners and is placed on the face of the sheet as part of the 

 title of the survey. Infrequently, due to unforeseen circumstances, the registry number 

 assigned to the field party is changed in the Office. In such cases, appropriate correc- 

 tions will be made in all the records and reports pertaining to that survey. 



155. Landmarks for Charts 



A report on landmarks for charts on Form 567 is required from practically all Chiefs 

 of Party. During the progress of the survey, each member of the party should note all 

 objects which will serve for this purpose. 



