I don't know if I attached a photo of the columns that were scanned but I have on this reply. Perhaps I am reading the side vision incorrectly, if so please help me understand why I am seeing what I am seeing, or not seeing in this case. My question / concern is why the columns do not appear to go to the top of the waterline (centerline of the screen), and why as I got closer to the columns did the ht of the columns appear to increase? To me that suggests that the Axiom / transponder is not reading at the 180 Deg angle but more likely something like 60 deg like the down vision. I may be incorrect in interpreting the image, but there also appears to be sonar imagery from bridge columns on the port side, located approximately 75-80' from the centerline.
Given that you had stated that you passed approximately 8' from the bridge columns and that the transducer is located approximately 3' inboard from the starboard gunwale, it would be expected that the closest point of the bridge column would appear approximately 11' out from the plot's centerline. The closest portions of the returned bridge column imagery appear to be plotted approximately 11' from the centerline of the plot. Within your screen snapshot, the image clearly shows the three bridge columns on the starboard side of the vessel. With respect to interpreting SideVision imagery, the closest portion of the imagery displayed will be no closer than the transducer is proximate to the object within the water column. As the outboard/outdrive shaft is aft of the relatively narrow fore/aft beam of the RV transducer, you should achieve good viewing to both port and to starboard. The latest transducer installations photos appear to show an optimal installation of the RV transducer. Thanks for including the requested additional photos. I also noticed that as I got closer to the bridge pilings they would appear closer to the top of the scan view, but if this is truly 180 deg. The 2nd transducer is for a Dragonfly but it was turned off during this scan.
view from it's mounting position, photo attached. The transducer is mounted with a clear 180 Deg. I have attached a screen shot of what I am seeing. For example when I drove past pilings for a bridge in 30-40 ft of water and I was about 8 ft from the pilings the scan only showed the bottom 2/3 of the pilings, and it didn't show the pilings on the other side that were about 50 ft away. I have noticed that my side imaging does not appear to scan at 180 Degrees as it is advertised, is there a setting to change this scan angle? It appears that I am seeing images that are picked up in my down imaging 60 deg. Hi I have an Axiom 9 with RV-100 transducer with 3D imaging / Side image / down scan etc.