Q373 - Navigation Problems: Chart Plot, USCG prep certification 2026

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1. The following questions (1-10) are based on the Army Corps of Engineers Mississippi River Maps (Cairo to the Gulf) and the Light List. AHP = Above Head of Passes LMR = Lower Mississippi River UMR = Upper Mississippi River OHR = Ohio River ACOE = Army Corps of Engineers At 0630, on 15 March, you are upbound on the Lower Mississippi River passing Kaiser Aluminum & Chemical Corp. (mile 234.0 AHP). The latest available information on the channel conditions above Baton Rouge that includes the latest buoy information, as well as recommended courses, is found in the __________.Not learned 2. You are upbound approaching Springfield Bend Lt. (mile 244.8 AHP) downriver from Profit Island. Which of the following statements is TRUE?Not learned 3. At 1218, on 16 March, you are passing the Vicksburg Gage (mile 437.0 AHP). What has been the average current since 0630, 15 March, if you have been making turns for 8.0 mph?Not learned 4. Which of the following statements regarding buoys on the Mississippi River is TRUE?Not learned 5. What is the mile point of the Rosedale, MS Gage?Not learned 6. The highest point on your towboat is 53 feet above the water, and the Helena Gage (mile 663 AHP) reads 3.9 feet. What is the vertical clearance when you pass under the B-span of the Helena Highway Bridge in Helena?Not learned 7. You are passing the Memphis Gage at 0405, 18 March. If you are turning for 8 mph and estimate the current at 2.3 mph, what is your ETA at Cairo Point, IL (mile 954.5 AHP)?Not learned 8. At what time would you listen to VHF Channel 22 (157.1 MHz) for information concerning the stage of the river between Memphis and Cairo?Not learned 9. As you approach French Point Light (mile 915.4 AHP), you see 2 daymarks on the structure. What significance do the daymarks have?Not learned 10. What is the distance from Cairo Point, IL, to Arkansas City?Not learned 11. The following questions (1-10) are based on the Army Corps of Engineers Mississippi River Maps (Cairo to the Gulf) and the Light List. AHP = Above Head of Passes LMR = Lower Mississippi River UMR = Upper Mississippi River OHR = Ohio River ACOE = Army Corps of Engineers On 3 January you get underway from Hall-Buck Coke Terminal Dock, Baton Rouge, LA, (mile 233.0 AHP) enroute to the Mobile Oil Docks (east side),(mile 176.4 UMR), in St. Louis. What is the length of the trip?Not learned 12. What are the dimensions of the Old River Lock on the Lower Old River (304 AHP)?Not learned 13. At 2142, on January 3, you pass Sebastapol Light (mile 283.3 AHP). At 0137, January 4, you pass Fort Adams Light (mile 311.4 AHP). You have been turning for 9.0 mph. What was the current?Not learned 14. At 0850, 4 January, you pass the Gage at Natchez, MS which reads 26.8 feet. The low water reference plane (LWRP) for Natchez is 6.1 feet. What is the water level in relation to the low water reference plane?Not learned 15. At 1300, 5 January, the river will be temporarily closed to navigation for six hours at mile 531.3 AHP due to repairs to a bridge. What minimum speed over the ground must you make from Natchez Gage in order not to be delayed?Not learned 16. Which type of daymark will you see as you approach Old Levee Light (mile 385.2 AHP)?Not learned 17. What is the vertical clearance of the Vicksburg Highway 80 Bridge when the river level is the same as the Low Water Reference Plane? The low water reference plane (LWRP) for Vicksburg, MS. is 0.1.Not learned 18. The Vicksburg Gage reads 31.9 feet. The high point on your towboat is 43 feet above the water. What is the vertical clearance as you pass under the Vicksburg Highway 80 Bridge?Not learned 19. In order to determine what buoys, if any, are in place at Concordia Bar crossing (mile 596.0 AHP), what should you check?Not learned 20. Which company utility crossing is at mile 529.7 AHP?Not learned 21. The following questions (1-10) are based on the Army Corps of Engineers Mississippi River Maps (Cairo to the Gulf) and the Light List. AHP = Above Head of Passes LMR = Lower Mississippi River UMR = Upper Mississippi River OHR = Ohio River ACOE = Army Corps of Engineers On the 10th of May at 1130, you leave the fleeting area at Gartness Lt mile 227.8 (AHP) bound for the Monsanto Terminal in St. Louis mile 178.0 (UMR). Your engines turn for 8.5 mph in still water. What is the length of the trip?Not learned 22. You estimate the current as 2.5 mph. What is the speed over the ground?Not learned 23. As you approach Casting Yard Dock Lt. (mile 265.4 AHP) you notice on the map a circle with 2 black sectors. This symbol indicates a __________.Not learned 24. From Baton Rouge to Cairo, what is the maintained minimum channel depth during low water?Not learned 25. On which map would you find Redman Point, Arkansas?Not learned 26. At 1000, on May 11th, you are passing George Prince Lt. mile 364.1 (AHP) in Natchez, Mississippi and must send an ETA to the terminal in St. Louis mile 178.0 (UMR). Your engines are still turning for 8.5 mph, and you estimate the current at 2.5 mph. What will be your arrival time at the terminal in St. Louis?Not learned 27. As you approach Ashland Light mile 378.1 (AHP) which daymark would you see?Not learned 28. What is your clearance as you pass under the Vicksburg Highway 80 Bridge mile 437.8 (AHP) if the Vicksburg Gage reads 14.8 feet and the highest point on your tow boat is 44.5 feet?Not learned 29. After entering Milliken Bend (mile 455 AHP) you wish to locate the river service in Madison Parish, Louisiana. The river service is indicated by the square containing which number?Not learned 30. At Filter Point Light (mile 475 AHP) there are 3 close straight dashed lines on the map passing through the black dot below the number 475. What do these lines represent?Not learned 31. The following questions (1-10) are based on the Army Corps of Engineers Mississippi River Maps (Cairo to the Gulf) and the Light List. AHP = Above Head of Passes LMR = Lower Mississippi River UMR = Upper Mississippi River OHR = Ohio River ACOE = Army Corps of Engineers On 3 January you get underway from Cambalick Dock, Morganza, LA, (mile 278.3 AHP) enroute to the Valvoline Pier RDB, (mile 176.3UMR). What is the length of the trip?Not learned 32. What are the dimensions of the Old River Lock on the Lower Old River (304 AHP)?Not learned 33. At 2126, you pass Morganza Bend Light (mile 278.4 AHP). At 0122, 4 January, you pass Red River Landing Gage (302.4 AHP). You have been turning for 7.5 mph. What is the current?Not learned 34. The Gage at Red River Landing reads 22.2 feet. The low water reference plane for Red River is 10.6 feet. How many feet is this above the low water reference plane?Not learned 35. The river will be temporarily closed to navigation at mile 531.3 AHP due to repairs to the bridge. This will occur at 1300, 5 January, and last for six hours. What minimum speed over the ground must you make from Red River Landing Gage to arrive before commencement of repairs in order not to be delayed?Not learned 36. What type of daymark will you see as you approach Joe Pierce Light (mile 335.4 AHP)?Not learned 37. What is the vertical clearance of the Natchez Highway Bridge (westbound) when the river level is the same as the Low Water Reference Plane (6.1 ft)?Not learned 38. The Natchez Gage reads 20.6 feet. The high point on your towboat is 47 feet above the water. What is the vertical clearance as you pass under the Natchez Highway Bridge?Not learned 39. In order to determine what buoys, if any, are in place at Concordia Bar crossing (mile 596.0 AHP), what should you check?Not learned 40. The area between Island 67 Upper Light (mile 623.1 AHP) and Sunflower Cut-off Foot Light (mile 624.8 AHP) is known as a __________.Not learned 41. The following questions (1-10) are based on the Army Corps of Engineers Mississippi River Maps (Cairo to the Gulf) and the Light List. AHP = Above Head of Passes LMR = Lower Mississippi River UMR = Upper Mississippi River OHR = Ohio River ACOE = Army Corps of Engineers On the 10th of May at 1130, you leave the fleeting area at Gartness Lt mile 227.8 (AHP) bound for the Monsanto Terminal in St. Louis mile 178.0 (UMR). Your engines turn for 8.5 mph in still water. What is the length of the trip?Not learned 42. You estimate the current as 2.5 mph. What is the speed over the ground?Not learned 43. As you approach Casting Yard Dock Lt. (mile 265.4 AHP) you notice on the map a circle with 2 black sectors. This symbol indicates a __________.Not learned 44. From Baton Rouge to Cairo, what is the maintained minimum channel depth during low water?Not learned 45. On which map would you find Redman Point, Arkansas?Not learned 46. At 1000, on May 11th, you are passing George Prince Lt. mile 364.1 (AHP) in Natchez, Mississippi and must send an ETA to the terminal in St. Louis mile 178.0 (UMR). Your engines are still turning for 8.5 mph, and you estimate the current at 2.5 mph. What will be your arrival time at the terminal in St. Louis?Not learned 47. As you approach Ashland Light mile 378.1 (AHP) which daymark would you see?Not learned 48. What is your clearance as you pass under the Vicksburg Highway 80 Bridge mile 437.8 (AHP) if the Vicksburg Gage reads 14.8 feet and the highest point on your tow boat is 44.5 feet?Not learned 49. After entering Milliken Bend (mile 455 AHP) you wish to locate the river service in Madison Parish, Louisiana. The river service is indicated by the square containing which number?Not learned 50. At Filter Point Light (mile 475 AHP) there are 3 close straight dashed lines on the map passing through the black dot below the number 475. What do these lines represent?Not learned 51. The following questions (1-10) are based on the Army Corps of Engineers Mississippi River Maps (Cairo to the Gulf) and the Light List. AHP = Above Head of Passes LMR = Lower Mississippi River UMR = Upper Mississippi River OHR = Ohio River ACOE = Army Corps of Engineers At 2345, on 25 December, you depart Memphis Harbor, McKellar Lake (mile 726.0 AHP - LMR) enroute to the Petroleum Fuel & Terminal Co. (144.6 AHP) in Angelina, LA, with a tow of eight full gasoline barges. If your vessel is making turns for 7.5 mph with an estimated average current of 1.5 mph, what is your ETA at the dock in Angelina, LA?Not learned 52. The highest point on your towboat is 67 feet above the water, and the Helena Gage reads +22.3 feet. What is the vertical clearance when you pass under the A-span of the Helena Highway Bridge?Not learned 53. Which of the following statements are TRUE?Not learned 54. At 0509, on 26 December, you pass under the Helena Highway Bridge (mile 661.7 AHP). What has been the average speed of the current since departing Memphis Harbor, McKellar Lake, if you have been making turns for 7.5 mph?Not learned 55. What is the distance in river miles, from the new mouth of the White River to the Petroleum Fuel & Terminal Co. (144.6 AHP)?Not learned 56. The Platte River empties into which river?Not learned 57. You are downbound, passing by Warfield Point Lt. (mile 537 AHP), when you observe on your Mississippi River map several black lines extending into the river from the bank. What do these lines indicate?Not learned 58. As you pass under the Vicksburg Bridges, you estimate the current as 3.0 mph. What is the speed over the ground, if your vessel is making turns for 10.5 mph?Not learned 59. As you approach Buckridge Light (mile 412.5 AHP), which type of daymark would you see on the light structure?Not learned 60. As you approach mile 659 (AHP), you notice on the map a dashed line crossing the river at mile 659.9 (AHP). What does this line indicate?Not learned 61. The following questions (1-10) are based on the Army Corps of Engineers Mississippi River Maps (Cairo to the Gulf) and the Light List. AHP = Above Head of Passes LMR = Lower Mississippi River UMR = Upper Mississippi River OHR = Ohio River ACOE = Army Corps of Engineers On 3 January you get underway from Cambalick Dock, Morganza, LA, (mile 278.3 AHP) enroute to the Valvoline Pier RDB, (mile 176.3UMR). What is the length of the trip?Not learned 62. What are the dimensions of the Old River Lock on the Lower Old River (304 AHP)?Not learned 63. At 2126, you pass Morganza Bend Light (mile 278.4 AHP). At 0122, 4 January, you pass Red River Landing Gage (302.4 AHP). You have been turning for 7.5 mph. What is the current?Not learned 64. The Gage at Red River Landing reads 22.2 feet. The low water reference plane for Red River is 10.6 feet. How many feet is this above the low water reference plane?Not learned 65. The river will be temporarily closed to navigation at mile 531.3 AHP due to repairs to the bridge. This will occur at 1300, 5 January, and last for six hours. What minimum speed over the ground must you make from Red River Landing Gage to arrive before commencement of repairs in order not to be delayed?Not learned 66. What type of daymark will you see as you approach Joe Pierce Light (mile 335.4 AHP)?Not learned 67. What is the vertical clearance of the Natchez Highway Bridge (westbound) when the river level is the same as the Low Water Reference Plane (6.1 ft)?Not learned 68. The Natchez Gage reads 20.6 feet. The high point on your towboat is 47 feet above the water. What is the vertical clearance as you pass under the Natchez Highway Bridge?Not learned 69. In order to determine what buoys, if any, are in place at Concordia Bar crossing (mile 596.0 AHP), what should you check?Not learned 70. The area between Island 67 Upper Light (mile 623.1 AHP) and Sunflower Cut-off Foot Light (mile 624.8 AHP) is known as a __________.Not learned