Ten-watt silicon solar-ceil modules are being tested to power typical naviga- 

 tion buoy signal lantern. 



system, as well as evaluating the MarAd-developed selective calling 

 equipment which uses middle-frequency, high-frequency, very- 

 high-frequency, and L-band transmissions via satellite. 



Mapping and Charting 



Another factor that must be considered in the modernization of our 

 maritime transportation system is the inadequacy of existing 

 navigational and tidal current charts. Survey and chart construction 

 criteria have been based on maximum vessel drafts of 45 feet. The 

 emergence of the new crude oil carriers, with drafts approaching 100 

 feet and lengths of nearly a quarter of a mile, has changed the 

 requirements for chart information. The sites thus far proposed for 

 the location of offshore terminals are all in waters deep enough to 

 permit ships with shallower drafts to traverse them easily and safely 

 using existing charts. New deep-draft ships in these areas, however. 



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