Single beam sounding system depth record of obstruction with surveyor’s annotations such as LTRA (Line turns right about), LR (Line resumes), 180 T ( course of surveying vessel), etc.
640 x 418 | 35.39 KB | |
1280 x 836 | 129.70 KB | |
1920 x 1254 | 284.62 KB | |
2617 x 1708 | 540.17 KB |
Added On | 16th October 2015 |
Viewed | 12 viewed |
Downloads | 1 Downloaded |