Name the fault in one sentence before the yard arrives
Three sentences cover the job. A vacuum fault is enclosure pressure on a gyro: the controller locks the brake and drops the drive, and the history stays in memory for the dealer. A seal fault is hydraulic oil leaving a fin actuator, a header tank, or a cooler into the bilge. A network fault is the helm page losing the controller while the local display still answers. If you cannot say which of those three you have, you are not ready to open a housing.
- Read the alarm on the stabilizer display, not only the pulsing helm box.
- Oil on a rod is a seal. A vacuum line in the history is not a reason to split that rod.
- A certificated boat still has to demonstrate steering changeover. A private yacht does not inherit that clock.
Who this note is for
You are the chief engineer, the refit foreman, the charter operator, or the surveyor who already has a boat in Florida and a stabilizer that will not stay online. You are deciding whether to hold the haul for a sphere, to contain oil at a fin, or to chase a network drop before either housing comes off. A curious reader with no boat and no alarm is not the caller.
- Holds
- + Alarm text photographed from the stabilizer display
- + A berth that matches one county or zone note
- + A certificated boat whose steering changeover you can describe
- Does not hold
- − A residential dock or a house generator
- − A city name with no yard, river, or county fact
- − A request to price a rebuild from a blank screen
How the manufacturer separates the alarm from the box
The Seakeeper 1 operation manual, doc. 90520-1, 4 June 2020, accessed 8 October 2026, is specific. The ConnectBox indicates the presence of an alarm only. Identifying it requires the application on the Seakeeper display or the multifunction display. Alarms lock the brake and shut down the motor drive. The alarm stays until Reset Alarm is pressed and the condition is gone. History is kept in the controller. That is the vacuum and sensor path. It does not describe a fin-rod seal, and it does not authorize a price.
The ConnectBox indicates the presence of an alarm only. The application on the display or the multifunction display identifies it.
What a certificated boat still has to show
46 CFR 58.25-10 treats main and auxiliary steering gear as separate systems, with a path to isolate a single hydraulic failure so steering can be maintained or regained. That is the rudder gear, not a fin stabilizer, unless your installation actually shares the power unit. Say that out loud before the work order says “steering.”
46 CFR 61.20-1 puts the marine inspector on the steering gear at each annual certificate renewal, or twice in five years with no more than three years between inspections, and requires a test of every automatic-to-manual changeover device. On a small passenger vessel, 46 CFR 176.814 makes the owner present that test, including manual mode with hydraulic pumps secured on a servo system. A network fault that hides the changeover is an inspection problem. A vacuum alarm on a private yacht is not.
There is no published diagnostic fee
| Item | Published? | Where it lives |
|---|---|---|
| Vacuum, seal, or network diagnosis | No public fee schedule | Verify with the yard after the fault is named |
| Steering-gear inspection interval | Yes — yearly, or twice in five years | 46 CFR 61.20-1 |
| Manual steering test on a small passenger vessel | Yes — each certification inspection | 46 CFR 176.814 |
| Local spill, noise, sanctuary, or stormwater numbers | Yes — and they differ | County notes, not this page |
Checklist for the three-fault call
- Photograph the display alarm and the history, not only the helm indicator.
- State oil evidence separately: rod, tank, cooler, or bilge. None is an acceptable answer.
- State whether the multifunction display, the local display, or both went dark.
- On a certificated boat, state whether manual steering still moves with pumps secured.
- Name the berth so the local note applies: yard, river, island dock, sanctuary, city storm system, or Sector Jacksonville.
The berth notes start at Counties. A New River yard is not the sanctuary rule. Read the Fort Lauderdale yard note only if that is the dock.1234
Questions from the wheelhouse
Why does the helm box pulse when the display has no alarm text?
On a Seakeeper 1, the ConnectBox only signals that an alarm exists. The operation manual (doc. 90520-1, 4 June 2020) says the Seakeeper application on the 5-inch display or the multifunction display is what identifies the alarm. The alarm does not clear until someone presses Reset Alarm and the condition is gone. A dark multifunction page is not yet a vacuum fault.
Does a vacuum alarm mean the sphere has to come out this haul?
Not from the alarm name alone. The manual treats the alarm as a lock-and-shutdown: the controller locks the brake and shuts down the motor drive, and it stores the history. A dealer reads that history. Pulling the sphere because the box pulsed, without the alarm line, is how a cooling or network fault becomes a rebuild.
Is a fin-seal leak a steering failure under 46 CFR 58.25?
Only if the stabilizer and the steering gear share a power unit or a piping failure that the rule actually covers. 46 CFR 58.25-10 is about main and auxiliary steering gear, including isolation of a single hydraulic failure so steering can be kept or regained. A fin actuator that does not power the rudder is not that gear. Say so before anyone writes “steering” on the work list.
Is there a published price for this diagnostic?
No county or Coast Guard schedule publishes a price for vacuum, seal, or network diagnosis. The published numbers around the job are inspection intervals and local penalties, and they are on the county notes. This page does not invent a fee.
Sources
- Seakeeper. “Seakeeper 1 Operation Manual,” doc. 90520-1, 4 June 2020. Accessed 8 October 2026. seakeeper.com.
- U.S. Coast Guard. “46 CFR 58.25-10 — Main and auxiliary steering gear.” Accessed 8 October 2026. law.cornell.edu.
- U.S. Coast Guard. “46 CFR 61.20-1 — Steering gear.” 12 June 2024 amendment. Accessed 8 October 2026. ecfr.gov.
- U.S. Coast Guard. “46 CFR part 176,” including § 176.814. Accessed 8 October 2026. ecfr.gov.