1. Man made obstacles; give types, location (grid coordinates), number of rows, interval between rows and spacing. A. anti-boat obstacles including fuel drums. B. anti-tank and personal obstacles.
2. Mines - same information as to obstacles including aircraft bombs.
3. Natural obstacles to landing craft. Location and extent.
4. Estimate of time and ability to remove obstacles.
5. Offshore beach conditions: A. Material and condition of bottom from 3 fathom line to high water mark, with attention to area near reef line. B. Location of one fathom line plotted on chart. C. Beach gradient. Right flank, left and center. Distance from reef line at 3, 2, 1 and 1/2 fathom depth.
6. Onshore beach conditions: A. Condition of beach on, or near reef line. Include terraces near water, giving height and distance inland. B. Material of beach. What type vehicle will it support. C. Beach gradient inland, including terraces and exits for vehicles.
7. Location of enemy fortifications and strong points, including beached or partially sunk vessels.
8. Estimated velocity of current.
9. Surf conditions: A.Distance of outermost breakers from reef line, depth of water in feet. B. Number of lines of breakers. C. Number of breakers per minute. D. Average height of breakers in feet. E. If waves come in cycles, get height and number of waves in cycle.
10. All information in areas where gas bubbles are sighted in water.
11. Estimate on localities suitable for placing pontoon causeways.
12. Plot graphs.
13. Other information.
14. Check cable or pipe line at our end of beach,
15. Do terraces continue into water.
16. Guns on volcano?
17. Effect of naval gunfire on terraces and beach.
18. Can LVT's be driven on terraces and beach.
19. Can weapons in volcano fire on beach.
Underwater Demolition Team 13
Photo: Estate of Victor Taraborelli
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