The most expensive part of an omni install is the hole in the boat: the tank, the tube, the glasswork and the fairing. Furuno kept the CSH-10 on the same hull tubes as the CSH-8L MK2 and CSH-5L MK2, which means a boat that already fishes an 8L has already paid for the hard part.
What stays
The tank and the 8-inch hull tube, if they pass inspection at haul-out. Your dealer will check the tube bore, the tank interior, the guides and the fairing before committing, but on a sound installation the structure carries over.
What changes
The electronics stack: transceiver, transducer, processor, control unit and the now-standard motion sensor, which together are the published $91,095 CSH-10 system. The hoist and shaft are new too ($9,265 and $1,970 to $4,750), and the new hoist is quicker, 7 seconds of travel at 400 mm against the old unit, with a 20-knot ship speed allowance.
What you gain on the screen
32 colors against 16, 1280x1024 against 1024x768, two HDMI outputs, independently stabilized transmit and receive beams from the standard motion sensor, and the native NavNet TZtouchXL page with sonar echoes overlaid on the chart. Furuno credits the motion sensor with about 20% better long-range detection than the previous model.
The path
Read the full upgrade guide on CSH10.com, have the tube and tank inspected at your next haul-out, and get an upgrade quote. If you are selling the 8L, the marketplace reaches buyers who already know what it is.
Published 2026-10-31. Sources: Furuno CSH-10 and CSH-8L MARK-2 brochures, Furuno USA product pages, InTheBite, Yachting and Power & Motoryacht.