Q398 - 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 0815, on the 16 of April, you depart the Exxon Refinery Docks (mile 232 AHP) bound for the fleeting area at Sycamore Chute Light (740.3 AHP). The horizontal clearance of the center span on the Baton Rouge RR and Highway 190 Bridge is __________.Not learned 2. You are at mile 230.0 AHP and see on the map a large rectangle outlined with a broken line . This indicates a __________.Not learned 3. As you pass Solitude Lt. (mile 249.0 AHP) which dayboard would you see?Not learned 4. Which of the following statements regarding buoys on the Mississippi River is TRUE?Not learned 5. What is indicated by the two light gray shaded areas that cross the river above False River Lt. (mile 251.0 AHP)?Not learned 6. What are the light characteristics of Greenwood Light (mile 288.6 AHP)?Not learned 7. After passing Wilkinson Lt. you see a flashing amber light on the right descending bank ahead. The flashing light indicates that you should __________.Not learned 8. At which of the following times would you be able to listen to lower Mississippi River conditions on VHF Channel 22?Not learned 9. At 0645, on the 17th of April, you pass Hole in the Wall Lt. (mile 373.4 AHP). What has been your average speed since departing the Exxon Refinery?Not learned 10. Your company wants to know at what time you will be arriving at the fleeting area at Sycamore Chute Light (mile 740.3 AHP) in Memphis, TN. You are making turns for 9.0 mph and you estimate the average current at 2.2 mph. Figuring the distance and time from Hole in the Wall Lt. (mile 373.4 AHP), what is your ETA at Sycamore Chute Lt.?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 Cambalick Dock, Morganza, LA, (mile 278.3 AHP) enroute to the Socony -Mobil Oil Docks (east side), LDB, 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 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 14. 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 15. 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 16. What type of daymark will you see as you approach Joe Pierce Light (mile 335.4 AHP)?Not learned 17. 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 18. 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 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. 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 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 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 22. 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 23. Which of the following statements are TRUE?Not learned 24. 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 25. 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 26. The Platte River empties into which river?Not learned 27. 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 28. 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 29. As you approach Buckridge Light (mile 412.5 AHP), which type of daymark would you see on the light structure?Not learned 30. 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 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 21 September, you are making up your tow at the fleeting area in Cairo, IL (mile 980.6 Ohio River). You get underway at 0952 enroute to New Orleans with a mixed tow. You are turning for 7.8 mph and estimate the current at 1.0 mph. What is your speed over the ground?Not learned 32. What is your ETA at Driver Upper Light (mile 782.2 AHP)?Not learned 33. What daymark should you see as you approach French Point Light (mile 915.4 AHP)?Not learned 34. You pass New Madrid, MO (mile 889.0 AHP) at 1412. What was your average speed since leaving Cairo?Not learned 35. At 1412 you increase speed to make good 10.2 mph. At 1506 you have a daymark on your port beam. Which daymark is this?Not learned 36. The charts show a circle with two black quadrants located at mile 846.0 AHP. What does this indicate?Not learned 37. The Helena Gage reads 2.3 feet. The high point on your towboat is 26 feet above water. What is the vertical clearance when you pass under the Helena Highway Bridge?Not learned 38. What company does NOT have a marine facility along the riverbank in Helena (mile 658 to 665 AHP)?Not learned 39. If you make good 10.2 mph, how long will it take to get to Fair Landing Gage mile 632.5 AHP from your 1506 position?Not learned 40. What are the light characteristics of the Bunge Corporation Terminal Lights (2) at mile 570.6 AHP?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 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 42. 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 43. Which of the following statements are TRUE?Not learned 44. 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 45. 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 46. The Platte River empties into which river?Not learned 47. 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 48. 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 49. As you approach Buckridge Light (mile 412.5 AHP), which type of daymark would you see on the light structure?Not learned 50. 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 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 0825 on 08 March, you get underway from the docks at mile 173.0 (AHP), enroute to the docks at mile 179.0 (UMR) in St. Louis, MO, with a tow of eight barges carrying cement. What is the distance from the River Cement Co. Dock to the mouth of the Ohio River?Not learned 52. You are approaching the Baton Rouge R.R. and Hwy 190 Bridge mile 233.9 (AHP). What is the horizontal clearance of the channel span?Not learned 53. You are turning for 9 mph, approaching Fort Adams Lt. (mile 311.4 AHP) and it is reported that the current at Knox Landing is estimated at 4.5 MPH. Which of the following statements is TRUE?Not learned 54. At 0715, on March 9, you pass Knox Landing Gage at mile 313.8 (AHP) and estimate the current will average 3.5 mph for the remainder of the time on the Mississippi River. What is your ETA at the mouth of the Ohio River if you increase speed to turn for 10 mph?Not learned 55. What is the vertical clearance between the highest point of your towboat, if it is 45 feet above the water, and if the Natchez Gage reads 23.4 feet when passing under the Natchez-Vidalia Westbound Highway Bridge?Not learned 56. In high water conditions, which publication would you consult for the latest information on buoys between Baton Rouge and Cairo?Not learned 57. As you approach Buckridge Light (mile 412.5 AHP), which type of daymark would you see on the light structure?Not learned 58. At 1019, on 10 March, you pass under the Greenville Bridge mile 531.3 (AHP). What was your average speed since departing the docks at mile 173.0 (AHP)?Not learned 59. 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 60. On which river is New Providence, TN located?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 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 62. You estimate the current as 2.5 mph. What is the speed over the ground?Not learned 63. As you approach 265 (AHP) you notice on the map a circle with 2 black sectors. What does this symbol indicate?Not learned 64. From Baton Rouge to Cairo, what is the maintained minimum channel depth during low water?Not learned 65. On which map would you find Redman Point, Arkansas?Not learned 66. 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 67. As you approach Ashland Light mile 378.1 (AHP) which daymark would you see?Not learned 68. 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 69. What is the horizontal width of the main channel span of the Vicksburg Bridge Interstate 20 at mile 437.7 (AHP)?Not learned 70. 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