broadband sonar behaviour with lwami

apx · 08-10-15, 08:05 AM

just got a prob/question:

1. the scenario
- created a custom mission to test it
- seawolf vs type 212 (very very silent sub) at 3kn
- my course 270° vs 90° - shipping towards with ~5nm distance between us at the nearest point (see picture - truth on, 10nm circle around the seawolf)
http://i.imgur.com/R24sOo9.png

2. my problem
- at (more or less) exact 10nm between us the contact appears on the mid/long-term waterfall BUT not on the short-term waterfall
http://i.imgur.com/ybKpfXC.png
but the towed also shows nothing
http://i.imgur.com/rRfrI6k.png
until (more or less) exact 5nm between us, then the contact on mid/long-term get bigger and a thin (maybe 1px) line also appears on the short-term

same on the 688i
http://i.imgur.com/UeHPssL.png

without lwami i haven't this problem at the 10nm-mark. there, the type 212 is invisible at all waterfall-screens, until i reach the 5nm-mark. then it appears on every waterfall-screens.

3. my strongly worded question
why?

08-10-15, 08:05 AM	#1
apx Swabbie Join Date: Aug 2014 Posts: 7 Downloads: 13 Uploads: 0	broadband sonar behaviour with lwami just got a prob/question: 1. the scenario - created a custom mission to test it - seawolf vs type 212 (very very silent sub) at 3kn - my course 270° vs 90° - shipping towards with ~5nm distance between us at the nearest point (see picture - truth on, 10nm circle around the seawolf) http://i.imgur.com/R24sOo9.png 2. my problem - at (more or less) exact 10nm between us the contact appears on the mid/long-term waterfall BUT not on the short-term waterfall http://i.imgur.com/ybKpfXC.png but the towed also shows nothing http://i.imgur.com/rRfrI6k.png until (more or less) exact 5nm between us, then the contact on mid/long-term get bigger and a thin (maybe 1px) line also appears on the short-term same on the 688i http://i.imgur.com/UeHPssL.png without lwami i haven't this problem at the 10nm-mark. there, the type 212 is invisible at all waterfall-screens, until i reach the 5nm-mark. then it appears on every waterfall-screens. 3. my strongly worded question why? Last edited by apx; 08-10-15 at 08:12 AM.