CHATFIELD
Marine operations communication changes as crews move between shore facilities, docks, vessels, decks and near-shore work areas.
ChatField keeps the smartphone as the user interface. Bluetooth links the phone to a J25 carried by each equipped worker, while participating J25 terminals provide the local LoRa mesh communication layer.
Procurement teams should separate the operating paths, crew roles and required safety systems before a sample trial. The field evaluation can then reproduce the real vessel-and-shore layout.
MARINE OPERATING ENVIRONMENTS
Local communication for working crews near vessels and shore.
Ports, docks and harbor services
Coordinate equipped workers moving between gates, storage areas, quays, vessels and shore facilities.
Small workboats and support craft
Evaluate local communication between crew positions, adjacent boats and defined shore contacts.
Commercial fishing and aquaculture
Support operational coordination around landing sites, pens, equipment, working decks and coastal facilities.
Coastal inspection and maintenance
Plan communication for teams moving along shoreline assets, piers, structures and near-shore routes.
OPERATING PATHS
Treat each vessel-and-shore path as a separate test.
Water may provide an open path, but vessels, cabins, steel structures, cargo, cranes, buildings and changing crew positions can still obstruct or alter the local radio link.
Shore to shore
Docks, warehouses, gates, offices, landing areas and moving workers along the waterfront.
Vessel to shore
Working deck, wheelhouse, mooring position, dock contact and transitions alongside the quay.
Vessel to vessel
Adjacent workboats, changing headings, separation, crew position and structures between the vessels.
Obstructed harbor sections
Cabins, hulls, cranes, buildings, stacked materials, breakwaters and other blocked or changing paths.
SYSTEM WORKFLOW
The phone remains the interface; J25 provides the local LoRa link.
- 01Worker uses the phone appPTT, text, voice messages, offline maps and team-location functions remain on the smartphone interface.
- 02Bluetooth links the paired J25The phone passes the local communication task to the J25 carried by that equipped worker.
- 03J25 sends through LoRaThe terminal exchanges information with another participating J25 inside the configured local team network.
- 04A participating node may support another pathWhen configuration and vessel-and-shore layout allow it, another equipped worker can participate in the local mesh path.
- 05The teammate receives it on the phoneThe receiving J25 passes the information to its paired smartphone for the operator.
J25 is carried by the worker and used through the paired smartphone. It is not presented as a conventional handheld marine radio.
Review the complete technical workflow →VESSEL + SHORE EVALUATION
Test the real crew positions, not a single advertised distance.
Useful performance depends on vessel structure, shore buildings, equipment, antenna position, interference, node placement, crew movement and the permitted configuration for the destination market.
| Marine condition | Buyer inputs | Field trial method |
|---|---|---|
| Quay and shore facilities | Buildings, gates, storage areas, working routes and fixed contacts | Walk the operating route and record required workflows at defined shore checkpoints. |
| Working deck and cabin | Hull material, deck levels, enclosed spaces and normal carry position | Test inside and outside the crew positions used during the actual task. |
| Vessel-to-shore path | Berth, movement, shore contact, structures and changing separation | Record results at departure, working positions, approach and return to the dock. |
| Vessel-to-vessel path | Boat size, headings, spacing, worker position and intervening structures | Test the planned operating pattern using the intended crew and device placement. |
| Wet and exposed work areas | Splash, rain, salt exposure, gloves, PPE and mounting or carry method | Confirm the selected product configuration and protective method before the operational trial. |
BUYER-DEFINED WORKFLOWS
Specify which local crew functions must pass.
Local group voice
Define which vessel, dock and shore roles require push-to-talk communication.
Text and voice messages
Evaluate short operational updates that do not require a live voice exchange.
Team location
Confirm how equipped workers and defined shore or vessel checkpoints appear in the phone workflow.
Offline working map
Prepare the port, coast or operating-area map data before leaving dependable internet access.
Local SOS procedure
Document the internal team response without presenting it as statutory marine distress equipment.
Crew and device setup
Confirm user groups, J25 allocation, app build and operator instructions used for the sample trial.
ENVIRONMENTAL REVIEW
Confirm the physical product configuration before use near water.
Marine work can add splash, salt, rain, gloves, PPE, vibration and mounting requirements. These are separate from the FCC radio test data and must be matched to the exact supplied product configuration.
Buyer questions
- Where will the phone and J25 be carried during the task?
- What splash, rain, salt and cleaning exposure is expected?
- Which gloves, PPE, mounts, cases or retention methods are required?
Claims not made here
- No unverified waterproof, saltwater or corrosion rating is claimed
- No approval for every vessel, port or marine work area is implied
- No selected accessory is assumed until the sample configuration is confirmed
SAFETY + COMPLIANCE BOUNDARY
Local mesh communication does not replace mandatory marine safety systems.
The procurement review must keep J25 local team communication separate from statutory vessel communications, navigation equipment and distress procedures.
Confirmed radio evidence
- J25 FCC ID: 2BVP9-J25
- LoRa: 903–927.5 MHz under the referenced FCC Part 15C report
- Bluetooth LE: 2402–2480 MHz under the referenced FCC Part 15C report
Not replaced by J25
- Marine VHF or other legally required vessel communications
- GMDSS, EPIRB, PLB, AIS or required distress and navigation equipment
- The operator’s emergency plan, watchkeeping procedure or public rescue services
SAMPLE EVALUATION PLAN
Reproduce one complete vessel-and-shore operation.
- Map the operation.Shore facilities, docks, vessels, decks, cabins, structures, routes and known cellular gaps.
- Map the crew.Vessel roles, shore contacts, moving positions, working schedule and expected separation.
- Define acceptance criteria.Required PTT, message, location, offline-map and local SOS workflows.
- Confirm the sample configuration.Market configuration, app build, device allocation, protective method, accessories and documents.
- Run the real paths.Record shore-to-shore, vessel-to-shore, vessel-to-vessel and obstructed-path results separately.
- Finalize the commercial scope.Confirm quantity, branding, packaging, lead time and market-specific document requirements.
MARKET-SPECIFIC CASES
Use the destination market and real operating path.
This solution page prioritizes U.S. procurement language. The separate UK and Spain pages preserve local operating context and do not imply completed customer deployments.
Field and near-shore operations
Review terrain, team spacing, permitted configuration and the actual land or near-shore route.
Open the UK case → SPAINMarine and coastal operations
Separate vessel-to-vessel, vessel-to-shore and obstructed harbor sections during evaluation.
Open the Spain case →Marine operations communication questions
Which marine teams can evaluate ChatField J25?
Port, dock, harbor-service, commercial fishing, aquaculture, coastal inspection and small workboat teams can evaluate J25 for local communication between equipped personnel where the selected configuration and local rules permit.
How does the phone-paired marine system operate?
The smartphone remains the interface for PTT, messages, offline maps and team location. Bluetooth connects the phone to the J25 carried by each equipped worker, while participating J25 terminals provide the local LoRa mesh communication layer.
How should a buyer test a marine operation?
Map shore facilities, docks, vessels, decks, structures and working routes. Test shore-to-shore, vessel-to-shore, vessel-to-vessel and obstructed harbor paths separately using the real crew positions.
Does J25 replace marine VHF or mandatory distress equipment?
No. J25 is presented as a local team communication tool for equipped personnel. It does not replace marine VHF, GMDSS, EPIRB, PLB, AIS or any legally required distress, navigation or safety equipment.
What FCC evidence is available for U.S. buyers?
J25 FCC material identifies FCC ID 2BVP9-J25 and FCC Part 15C reports for LoRa operation at 903–927.5 MHz and Bluetooth Low Energy at 2402–2480 MHz.