theONE theONEVESSEL COMMAND CENTER
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Log engine and generator hours

How hour tracking works, where to type it, how it drives maintenance.

Engine and generator hours are the most important number for maintenance. theONE tracks them per-engine and uses them to compute when service is due.

Steps

  1. Set the baseline

    When you first add an engine in Vessel Setup, type its current hour reading. That's the baseline. Every reading after is a delta.

  2. Log a new reading

    On Mission Control, tap an engine's coolant or oil tile → metric history → Update reading. Or open the engine's System Detail from Vessel Briefing (or Search) and update its hours there. Settings → Vessel Setup → Main Engines is a setup editor, not the system detail page — nothing under Vessel Setup opens one.

  3. End-of-cruise prompt

    The End Trip wizard's Step 4 asks for current hours per engine. Update them there if you didn't log them during the trip.

  4. How hours drive service

    A system carries ONE service interval — hours between services, plus the hours reading at the last service — set on its Service Interval card. Separate named jobs (oil, filters, impeller, zincs) are work orders, each with its own interval. theONE shows hours to next service on the system detail and on the Maintenance board, and flags what is close to due. There is no per-system list of named intervals.

  5. Automatic hours — with a bridge installed

    With a gateway connected, hours read off the NMEA 2000 network automatically — PGN 127489 carries the engine's own running total. theONE RECONCILES that against what you have logged rather than overwriting you, because a replaced ECU or a swapped engine would otherwise rewrite your service history. Hand entry is one tap from any engine tile and still wins when you use it.

    This needs a NMEA bridge (a Wi-Fi gateway) physically installed on the boat's NMEA 2000 network. Without one there is nothing to read and entry stays by hand.

  6. The hours pill

    An amber pill appears on Mission Control when a unit has gone more than 14 days without a reading AND a trip has ended since. A boat sitting in the slip is never asked. Tap it to log the reading. Change the 14 days, or switch it off, under Settings → Preferences → Reminders.

  7. From the Work List, and at end of cruise

    An hours-based job on the Work List opens the hours sheet on tap — same sheet as the unit's page. At end of cruise, your mains are asked for by name; a genset or watermaker sits under one "Also log hours" row, one tap away.

  8. When two readings disagree

    You read the meter at 1204.3 and the mate, who was off the boat, reads it at 1195. Both entries are real and both stay in the log — but the boat can only count from one figure, and until now it quietly took whichever arrived last.

    Now it asks. The Hours tile on Mission Control shows “Port main engine — two readings disagree” with both numbers and whose each one is. Tap it and you get three choices: use theirs, keep yours, or go and read the meter yourself. Nothing is thrown away whichever you pick, and the question comes back if the two drift apart again.

    It only asks when the gap is material — five hours by default — and only for an absolute meter reading. “Ran 4.5 hours today” is not a claim about what the meter says, so it never raises this. And a meter only counts up: taking a LOWER figure needs “Enter the right reading” or a Log Meter Rebuild, which is the door for a meter that was swapped.

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