1. Instructor Note Instructor Note:
This file contains a correction for the Squadron Boating Course, Chapter 12, slide #52
Delete slide #52 & #53 and insert slide #2 & #3 from this file
Carefully read the comments on the ppt “Notes Page”. That is, click on “View” and then “Notes Page”.
The revisions on slide #3 are just the animated arrows.

2. Tug towing a barge, crossing left to right >>
Perspective: you are viewing the starboard side of both vessels.
If you are viewing the tug and tow abeam of its starboard side and it is proceeding from left to right in your field of view, you will not be able to see either vessels' white stern light or the yellow towing light on the tug. The reason you can't see them is because they are not all around lights. They are 135° lights only visible from 67.5° port or starboard of dead astern.
  There are only three possible light patterns that you would see in the dark with a tug and tow of this length. Please refer to the excellent plates in the back of Chapman's Piloting, Seamanship & Small Boat Handling ( page 591 in my edition) that show what lights will be visible with a tug towing.
Tug towing a barge,
crossing left to right
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3. Navigation Light Patterns Reminder - “Tug Towing”
135° sector lights
Tug with tow less than 650 ft. long
The purpose of this slide is just to remind students of the light pattern of a tug towing. This is shown in Figure 115 of the student manual. Students may not have memorized the multi-light configuration. Tug towing scenarios are common on the Great Lakes, major rivers and in coastal waters.
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