Starting a separate discussion related to the garmin thru hull transducer thread but specific to my boat build... I'm researching transducer options right now and know I'll be getting the Airmar 1KW wide band chirp thru hull to mate to three Garmin 8612's, but it's hard to decide which models are best for my application. Holes will be drilled in the hull, so I'd like to fill them with the right equipment the first time and with the future in mind, even it it's overkill *for now*. My situation: - aluminum hull - salmon, bottom fish, and perhaps trolling for tuna when I make an infrequent run to the blue. - Garmin network (MFD 8612 x3) - thru hull transducer(s) will be midship ~13 feet ahead of the transom back. - Garmin PS30 panoptix down-vue/live-vue for when trolling and bottom-fishing, flush-mounted off the pod. - boat will be wet-slipped year round, never beached, pulled onto trailer for service in DIY yard. Decision points: 1) Fairing block vs. traditional thru-hull cylinder. I'd prefer not to have the fairing block due to its taller profile (turbulence, damage from debris, trailer clearances, etc.), but if the performance is better than cylinder then will consider. Would like to hear pros/cons of those who run a fairing block, I've never experienced one. 2) SS275-LHW 1KW fairing block (custom, per @53driver in the other thread) vs. SS175-HW + SS175-M 1KW cylinders. There is no SS175-MW, so the combo isn't quite apples-to-apples with the SS275-LHW, but I'm not sure I need wide beam for depths > 500'? I also don't know if two physically separate ducers will interfere with each other or if the MFD user experience will be a PITA. I've never ran more than one before. 3) Do I need a GSD-26 or will the transceivers in the 8612's suffice? From what little I've been able to find online, the GSD-26 seems to only be needed for 2KW+. What do I lose at 1KW without the GSD-26? Would be nice to see screen shots with and without the black box if anyone has any. Would appreciate feedback from the transducer experts out there. thx, Barry.