70 NAUTICAL CHART MANUAL 



WRECKS (O) 



Chartered wrecks are generally of two kinds, stranded or sunken, the former term applying 

 where any portion of the hull is above the sounding datum, and the latter applying to those dan- 

 gerous or nondangerous wrecks which are below the chart datum or where the masts only are 

 visible. A sunken wreck with less than 11 fathoms of water over it is considered one which 

 may be dangerous to surface navigation (see pg. 71). 



Wrecks cleared by wire drag should be indicated on the charts by the special symbol 

 provided. 



The symbol for a dangerous wreck differs from that for a nondangerous wreck in that 

 the symbol for the former consists of the sunken wreck symbol surrounded by a dotted curve. 

 For emphasis, a blue tint should be added within the danger curve around wrecks. 



All nondangerous (as well as dangerous) wrecks are to be charted on Alaskan charts, 

 regardless of depth. In other areas except on "Wreck Charts," nondangerous wrecks shall not 

 be charted outside of the 20-fathom curve; however, those now charted shall be retained. 



On the "Wreck Charts," (for benefit of fishing industry) twenty-two to date (71, 1106- 

 1117 inch, 1207, 1215, 1219, 1222, 3075, 3076, 5020, 5021, and 5022) all known dangerous or 

 nondangerous wrecks are to be shown out to the 300-fathom curve. Nondangerous wreclis 

 shown on Wreck Charts 1207, 1215, and 1219 shall be omitted from the 1100 series. The 

 seaward limits of these 1200-series charts and an explanatory note shall be shown in magenta 

 on the 1100 series. 



When wrecks or obstructions are searched for with the wire drag and the reported position 

 is cleared, with no hang obtained, the maximum clearance is to be shown on the Wreck Charts 

 only. The "basket" symbol will be retained, but the descriptive term (i.e. "Wreck or Obstr") 

 should be omitted. Nothing will be shown on the other charts except when shoals or rocks are 

 also cleared as specified under WIRE-DEAG SURVEYS. 



The symbol and all references of a wreck or obstruction are to be removed from all charts 

 when the word "raised" is used in the Wreck List or other sources such as Notice to Mariners. 



When the words "destroyed" or "demolished" are used, the symbol shall be retained on 

 the Wreck Charts only. 



According to the regulations given above, some wrecks will be treated dififerently on the 

 Wreck Charts than on other charts, while others will appear only on the Wreck Charts. A 

 comparison of the overlap between a Wreck Chart and a non-wreck chart shall accordingly 

 be guided by these instructions. 



Information relative to wrecks shall be published in the Notice to Mariners. 



