Raymarine iTC-5 Analog to Digital Transducer Converter

The Raymarine iTC-5 is the upgrade-path enabler for boats running older Raymarine analog instrument systems. Raymarine's instrument lineup has gone through several generations: the original ST30/ST40 analog instruments from the 1990s, the ST50 and ST60 mid-1990s through 2000s analog displays, the ST70 hybrid analog/digital era in the late 2000s, and the current digital i70 and ST70 Plus generation. Each generation used a slightly different protocol for talking to the dash displays - and crucially, the transducers (the actual sensors mounted on or in the hull) outlived multiple generations of dash displays. A 25-year-old Raymarine knotmeter through-hull paddle wheel is still a perfectly good speed sensor in 2026 - what's outdated is the analog ST30 display that originally read it, not the sensor itself.

The iTC-5 solves the upgrade problem. It's an ultra-compact black box (about the size of a paperback book) that accepts five common analog transducer inputs on one side and outputs digital SeaTalkng/NMEA 2000 data on the other side. The five supported inputs are: (1) Depth - the through-hull depth transducer used on Raymarine ST series instruments. (2) Speed/Temperature - the paddle wheel speed sensor (which also contains a temperature sensor on most models). (3) Wind - the masthead wind sensor with apparent wind angle and speed signals. (4) Compass - the fluxgate compass module for heading data. (5) Rudder - the rotary or linear rudder feedback transducer for rudder angle indication and autopilot rudder reference.

What "convert to digital SeaTalkng" actually means. The analog signals coming from older Raymarine transducers are simple voltage or pulse-based signals that don't carry the device identity, calibration metadata, or diagnostic information that modern digital protocols use. The iTC-5 reads each analog signal, applies the appropriate calibration coefficients (depth offset, speed calibration factor, wind angle calibration, etc.), and outputs the data as proper SeaTalkng PGNs (Parameter Group Numbers - the standard NMEA 2000 data unit). Any digital instrument display or MFD on the network can then read the data exactly as if it came from a brand-new digital transducer.

What's connected and where. The iTC-5 has five dedicated analog input ports on the front face (each labeled for its specific transducer type) and one SeaTalkng output port on the base. Plug each existing analog transducer into its matching input. Connect the SeaTalkng output to your boat's SeaTalkng backbone via the included drop cable. Power comes through the SeaTalkng network - no separate 12V power feed required for the iTC-5. The unit also provides the power and communication signals back through the transducer ports to power any transducers that need it (the wind transducer in particular needs the iTC-5 to power it).

The cost case. A full transducer replacement for a typical instrument system - depth, speed, wind, compass, and rudder all converted to modern "smart" digital transducers - runs over a thousand dollars per transducer for the high-end "smart" versions. Five transducers + new displays = $5,000+ system upgrade. The iTC-5 + new displays approach reuses the existing transducers, so the upgrade cost is the iTC-5 (about $370) + the new displays only. Same data quality, same display capabilities, fraction of the cost.

Compatible with current Raymarine digital displays. The iTC-5's primary use case is feeding the i70 and i70s digital instrument displays (the current-generation Raymarine multi-function instrument that replaces the older ST60 single-function displays) and the ST70 Plus (the previous-generation hybrid display that's still common on boats). Once the iTC-5 is on the SeaTalkng network, any compatible Raymarine display can read the data - so you can upgrade displays incrementally without replacing them all at once.

Eliminates per-instrument pod modules. Some legacy Raymarine setups used individual "pod" interface modules (one pod per transducer type) to convert older analog signals to the newer digital network. The iTC-5 replaces all five pods with a single unit - significantly less hardware, less wiring, less complexity, lower cost. For boats that already have multiple pods installed, swapping to a single iTC-5 simplifies the system and frees up space in the install location.

SeaTalkng IS NMEA 2000. SeaTalkng is Raymarine's branding for their implementation of the NMEA 2000 marine network protocol - electrically and protocol-wise, SeaTalkng IS NMEA 2000 with a slightly different connector (Raymarine uses a 5-pin micro-C connector that's mechanically distinct but electrically standard). This means data from the iTC-5 can be read by any NMEA 2000-compatible device on the network, not just Raymarine displays. Engine instruments, AIS receivers, autopilots, third-party MFDs - if it's NMEA 2000 capable, it sees the iTC-5's transducer data.

Calibration handled by the displays. The iTC-5 itself doesn't have a separate calibration utility - all transducer calibration (depth offset, speed calibration factor, wind angle offset, compass deviation, rudder zero point) is set through the connected i70 or ST70 Plus display's menu system. Standard Raymarine instrument calibration workflow - if you've calibrated Raymarine instruments before, the procedure is the same.

Multiple iTC-5 units supported. For complex installations with more than 5 analog transducer inputs (e.g., dual speed sensors port and starboard, or both fluxgate compass and rate gyro), multiple iTC-5 units can sit on the same SeaTalkng backbone. Each unit operates independently and contributes its data to the network. SeaTalkng/NMEA 2000 handles the multi-source data routing automatically.

Compact form factor for tight install locations. The iTC-5 is intentionally small (smaller than typical instrument pod modules of the previous generation) so it fits in the back of the dash, in the bilge, in a wire chase, or wherever's convenient near the transducers. Wall-mount or panel-mount with the included hardware.

For boats running Raymarine analog instrument systems that want to upgrade displays without replacing transducers, the iTC-5 is the right answer. The unit has been in production for years and is well-regarded across the recreational marine community for its reliability and the cost savings it delivers on upgrade projects. Raymarine's warranty applies and the service network handles any in-warranty issues.