
Originally Posted by
rnvinc
Sometimes fish are difficult to discern in SI for the simple fact that the image ratio is so much smaller in the SI image...
This is largely determined by the SI range setting....scanning farther out to the sides requires the the unit to "squash" more data into the same size screen ....making individual echo returns even smaller...
This can be overcome to a certain degree by scanning shorter ranges or scanning 1 side only ...which, in effect, allows the unit to "spread" the data out across the display more ...making individual echo returns larger ...and easier to pick out...
One idea is to find structure using the SI and set a waypoint on it...then reposition the boat to effectively fish the structure with the 2d sonar or the DI sonar...
Another idea is to recognise recent success in similar structure...if fish have been found successfully in brush in 15ft of water...finding a "new" piece of brush with the SI in similar 15ft water depth would indicate a good possibility that fish "should" be present in the "new" found structure...(so maybe a little more time should be spent probing this new found structure just because they "should" be there...even tho the fish echoes may not be evident in the image...)
Rickie
Good job, Rickie...
USS Intrepid CVS-11 Helicopter Squadron-3 1960-1964
When I keep my gratitude higher than my expectations I have a good day