9131 HYDROGRAPHIC MANUAL PaGE 812 



Protractors, three-arm metaJ and celluloid. 



Scales, metric. 



Sextant. 



Tapes, 300-foot and 30-meter. 



Theodolite (not necessary unless some special field work is required). 



Watch. 



For accounts, the following items are required 



All necessary stationery and forms for submitting monthly accounts, truck record, launch log, etc. 

 Approved estimates (obtain these before going into the field). 

 Contracts for supplies: 



Tires and tubes. 



Spark plugs. 



Batteries. 



Arrange for credit cards for the purchase of gasoline and oil. 

 Orders— allowance for mileage, etc. 

 Requisition of funds and checks. 



c. Local federal offices. — Before beginning field work, the reviser should obtain as 

 many addresses as possible of the local offices maintained by various federal agencies 

 in the region to be inspected. These are published in the appendix of the Coast Pilot 

 (see 9135B(5)). Many of these offices are important sources of information. 



d. Transportation. — The principal means of transportation to be used must be 

 determined. This may be by boat or truck. There are advantages to both and the 

 matter should be carefully weighed, with the particular region and the comparative 

 expense in mind. 



In some regions a boat is indispensable, and the best size is one large enough to 

 include living ^quarters for the party. In other localities the principal traveling may be 

 by truck, and local launches can then be used. In such cases, an attempt must be 

 made to arrange for the temporary use of launches operated by the Bureau, or by some 

 other government agency. If this is impracticable, private launches may be char- 

 tered as required. Ferry boats and local steamers can be used to advantage. 



If possible, authority should be obtained from the Commandant, United States 

 Coast Guard, for the reviser to travel on the vessels of that bureau. In some ports 

 limited cooperation of this kind may be obtained from the United States Corps of 

 Engineers, or ^om port authorities. 



e. Duplication oj information. — Several federal agencies publish information for- 

 merly found only in Coast Pilots. Some of these publications are kept current by 

 daily or weekly corrections issued free of charge. Information thus available should 

 not be repeated in the Coast Pilots except in special circumstances. In particular, 

 information that is subject to frequent changes should be omitted; for example, light 

 and fog-signal characteristics. If such information were included, it might be obsolete 

 before the new edition of the Pilot is issued. Furthermore, it would be undesirable 

 duplication, since details of such changes may be found in three other publications 

 that are issued free of charge. Coast and Geodetic Survey charts also show these 

 changes, being corrected by hand to the date of issue. Likewise wdth many other 

 instances of duplication — and the reviser will save himself a great deal of needless 

 work and have a much more legible Field Record Book if he keeps this constantly 

 in mind. 



/. Extent oj detail. — Excessive detail must be avoided. The size and type of 

 vessels using each particular waterway must be taken into account, as well as the 

 amount of traffic. Usually the requirements, not only of the professional navigator, 

 but of the yachtsman and fisherman as well, must be kept in mind. Allowance must 



