PGNs 130578, 130842, 130843 and 130846

[astolfo]

Hello, I am working on a project with a Pixel-sur-Mer Exocet Silver, and we want to leverage PGNs 130578, 130842, 130843 and 130846 coming out of 2 SCX-20.
We want to leverage these sentences to better correct for motion and acceleration, derive "sea state" and leverage these values in our project.

Does anyone know how gather a full detailed breakdown of Furuno SCX-20 PGNs 130578, 130842, 130843, and 130846, field-by-field, including offsets, lengths, types, units, resolutions and any Furuno-specific customizations if present.
Is there a specific department we need to reach out?

Thank you
Astolfo

 

[Johnny Electron]

Sentence breakdown is based on established standards from NMEA.org. You would need to contact them for details on structure and fields as they own the rights. The Furuno is NMEA certified and follows the established standard.

 

[astolfo]

Does it not each Marine electronic company choose what type of data they put in the propriety PGNs like the ones I mentioned? for example I know B&G-Simrad, Raymarine, SBG, Exail (formerly known as iXblue), Garmin and many others do.
The format is dictated by NMEA but not the content.

Here is what I know.

Furuno SCX‑20 – Proprietary PGN Breakdown

Field‑by‑field descriptions for PGNs 130578, 130842, 130843 and 130846.

PGN 130578 – Vessel Speed Components

Standard fast‑packet (12 bytes). SCX‑20 uses only ground‑referenced fields.
Field Name Offset Length Type Resolution Units Description Notes
Longitudinal Speed (Water‑ref) 0 2 B Int16 0.001 m/s Fwd/Rev speed through water N/A on SCX‑20
Transverse Speed (Water‑ref) 2 2 B Int16 0.001 m/s Lateral water speed N/A on SCX‑20
Longitudinal Speed (Ground‑ref) 4 2 B Int16 0.001 m/s Forward speed over ground Primary value
Transverse Speed (Ground‑ref) 6 2 B Int16 0.001 m/s Side‑drift over ground Leeway component
Stern Speed (Water‑ref) 8 2 B Int16 0.001 m/s Astern water speed N/A
Stern Speed (Ground‑ref) 10 2 B Int16 0.001 m/s Astern speed over ground when reversing

PGN 130842 – Six DoF Motion

Furuno‑proprietary fast‑packet (29 bytes) with raw IMU data.
Field Name Offset Length Type Resolution Units Description Notes
Manufacturer Code bit0 11 b UInt11 1 1855 = Furuno identifies proprietary
Industry Code bit13 3 b UInt3 1 4 = Marine
Motion Data A 2 4 B Int32 proprietary X‑axis motion scale unknown
Motion Data B 6 4 B Int32 proprietary Y‑axis motion
Motion Data C 10 4 B Int32 proprietary Z‑axis motion
Motion Data D 14 1 B Int8 proprietary Status / minor undocumented
Motion Data E 15 4 B Int32 proprietary Additional motion
Motion Data F 19 4 B Int32 proprietary Additional motion
Motion Data G 23 2 B Int16 proprietary Angular comp. roll rate?
Motion Data H 25 2 B Int16 proprietary Angular comp. pitch rate?
Motion Data I 27 2 B Int16 proprietary Angular comp. yaw rate?

PGN 130843 – Heel & Roll Info
Furuno‑proprietary attitude PGN (10 bytes).
Field Name Offset Length Type Resolution Units Description Notes
Manufacturer Code bit0 11 b UInt11 1 1855
Industry Code bit13 3 b UInt3 1 4 = Marine
Heel status (A) 2 1 B UInt8 – Heel indicator undocumented
Field B 3 1 B UInt8 – Proprietary status
Yaw rate 4 2 B Int16 0.0001 rad Yaw rate ≈0.0057°/s LSB
Pitch 6 2 B Int16 0.0001 rad Pitch angle
Roll 8 2 B Int16 0.0001 rad Roll / Heel

 

[Johnny Electron]

Proprietary information is not disclosed as it is specific to the company special needs and partnerships. Any details will not be disclosed here nor what you have posted confirmed in any way. Normally Proprietary information can be disclosed to partner companies who have signed no disclosure agreements. Any devices going on the 2000 bus really should be tested and certified by NMEA.Org both standard and proprietary information. If you reside in the Furuno USA sales and service area and wish to see if your project is something Furuno wishes to partner, please contact product development directly. If outside the USA area, please contact you Furuno National Distributor in the country you reside.