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Figure 1l shows the bottom topography drawn from the 
color photographs by Kelsh Plotter. This is a section of 
a preliminary or reconnaissance map prepared as a guide 
for the hydrographer. Depths are approximate but the rela- 
tive positioning of shoals, channels, and other submarine 
features 1s quite good. This information will be trans- 
ferred to the boat sheet, or hydrographic work sheet, prior 
to hydrography and will indicate to the hydrographer the 
bottom features that require special development and also 
the maximum settings of the wire drag or sweep, in any given 
area. 
This same information and the color photographs will 
also assist in the shaping of depth curves during the smooth 
plotting of the hydrography. In fact, the color photography 
will sometimes permit us to complete depth curves in shoal 
waters that were not completed by the hydrography. As an 
example, Figure 2 shows an area between Great St. James Is- 
land and Little St. James Island where during prior surveys 
no hydrography was done because of the difficulty of entry. 
The depth curves shown on Figure 3 in this passage were com- 
pleted solely from color photography. 
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