Vessels / IMO 9304590
OPTIMAL ACE
IMO 9304590 · Vessel observations and history
Recorded observations associated with this IMO number. AIS identifiers are self-reported and can contain errors. Events describe observations, not proof of unlawful activity.
Latest available information
- IMO
- 9304590
- Latest matched MMSI
- 477215800
- List name
- OPTIMAL ACE
- Listed flag
- Hong Kong SAR China
- Reported destination
- TANGER MED
- Latest AIS observation
- 2026-10-20 23:52:35 UTC
- Observed coordinates
- 35.7811, -4.9559
The observation time indicates when the position was received. It does not establish the vessel's current location. The listed flag comes from the watch list record.
Recent recorded track
Available positions from the past 48 hours for the latest matched MMSI. Reception gaps remain gaps. Earlier tracks may be preserved with individual events below.
The interactive map requires JavaScript. Recorded events and observations are listed on this page.
Watch list references
This IMO is included in the tracker's current watch list. List inclusion alone does not establish current legal status or confirm shadow fleet activity. Check the linked records for scope and updates.
References describe the latest stored list record. Read the methodology and limitations.
Recorded events
Latest 46 recorded events, up to 50. All times are UTC. Open an event for its measurements and available archived tracks.
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Signal returned
A position was observed after a prolonged AIS gap. The recorded distance is between the last and returning observations, not a known route through the gap.
Gap duration: 12.7 h · Distance between observations: 218.6 km · Implied average speed: 9.3 kn
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AIS gap
No further position was observed for the detection interval in an area with established AIS reception. This observation does not establish why the signal was lost.
Last signal before gap: 2026-10-19 18:08:40 UTC · Reception in preceding 24 h: 24 h · Last reported speed: 10.2 kn
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Signal returned
A position was observed after a prolonged AIS gap. The recorded distance is between the last and returning observations, not a known route through the gap.
Gap duration: 66.7 h · Distance between observations: 1284.6 km · Implied average speed: 10.4 kn
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AIS gap
No further position was observed for the detection interval in an area with established AIS reception. This observation does not establish why the signal was lost.
Last signal before gap: 2026-10-16 00:40:16 UTC · Reception in preceding 24 h: 24 h · Last reported speed: 10.1 kn
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Vessel encounter
The tracker observed two vessels staying close together for a sustained interval in relatively quiet surroundings.
First observation: 2026-10-15 11:06:18 UTC · Last close observation: 2026-10-15 12:03:48 UTC · Observed duration: 57 min
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Signal returned
A position was observed after a prolonged AIS gap. The recorded distance is between the last and returning observations, not a known route through the gap.
Gap duration: 38.2 h · Distance between observations: 699.8 km · Implied average speed: 9.9 kn
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AIS gap
No further position was observed for the detection interval in an area with established AIS reception. This observation does not establish why the signal was lost.
Last signal before gap: 2026-10-13 10:15:11 UTC · Reception in preceding 24 h: 24 h · Last reported speed: 10.6 kn
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Vessel encounter
The tracker observed two vessels staying close together for a sustained interval in relatively quiet surroundings.
First observation: 2026-10-12 03:34:18 UTC · Last close observation: 2026-10-12 04:13:48 UTC · Observed duration: 39 min
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Signal returned
A position was observed after a prolonged AIS gap. The recorded distance is between the last and returning observations, not a known route through the gap.
Gap duration: 13.1 h · Distance between observations: 272.6 km · Implied average speed: 11.3 kn
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AIS gap
No further position was observed for the detection interval in an area with established AIS reception. This observation does not establish why the signal was lost.
Last signal before gap: 2026-10-10 07:59:45 UTC · Reception in preceding 24 h: 24 h · Last reported speed: 11.1 kn
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Signal returned
A position was observed after a prolonged AIS gap. The recorded distance is between the last and returning observations, not a known route through the gap.
Gap duration: 80.8 h · Distance between observations: 211.3 km · Implied average speed: 1.4 kn
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Reported draught change
The draught entered in the AIS report changed. This can be consistent with a cargo operation, but AIS draught is manually reported and is not a direct measurement.
Previous reported draught: 9.8 m · New reported draught: 11 m · Reported draught difference: 1.2 m
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AIS gap
No further position was observed for the detection interval in an area with established AIS reception. This observation does not establish why the signal was lost.
Last signal before gap: 2026-10-06 10:36:43 UTC · Reception in preceding 24 h: 24 h · Last reported speed: 7.6 kn
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AIS gap
No further position was observed for the detection interval in an area with established AIS reception. This observation does not establish why the signal was lost.
Last signal before gap: 2026-10-02 10:29:47 UTC · Reception in preceding 24 h: 20 h · Last reported speed: 0 kn
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Signal returned
A position was observed after a prolonged AIS gap. The recorded distance is between the last and returning observations, not a known route through the gap.
Gap duration: 12.9 h · Distance between observations: 0.3 km · Implied average speed: 0 kn
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Signal returned
A position was observed after a prolonged AIS gap. The recorded distance is between the last and returning observations, not a known route through the gap.
Gap duration: 9.4 h · Distance between observations: 0 km · Implied average speed: 0 kn
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Signal returned
A position was observed after a prolonged AIS gap. The recorded distance is between the last and returning observations, not a known route through the gap.
Gap duration: 56.5 h · Distance between observations: 44.8 km · Implied average speed: 0.4 kn
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Reported draught change
The draught entered in the AIS report changed. This can be consistent with a cargo operation, but AIS draught is manually reported and is not a direct measurement.
Previous reported draught: 7.5 m · New reported draught: 9.8 m · Reported draught difference: 2.3 m
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AIS gap
No further position was observed for the detection interval in an area with established AIS reception. This observation does not establish why the signal was lost.
Last signal before gap: 2026-09-28 22:28:06 UTC · Reception in preceding 24 h: 24 h · Last reported speed: 7 kn
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Signal returned
A position was observed after a prolonged AIS gap. The recorded distance is between the last and returning observations, not a known route through the gap.
Gap duration: 39.8 h · Distance between observations: 0.8 km · Implied average speed: 0 kn
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Possible ship-to-ship transfer
Two vessels were observed close together and moving slowly for a sustained interval. Proximity and speed alone do not confirm a cargo transfer.
First observation: 2026-09-27 00:16:48 UTC · Last close observation: 2026-09-27 02:10:48 UTC · Observed duration: 114 min
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Signal returned
A position was observed after a prolonged AIS gap. The recorded distance is between the last and returning observations, not a known route through the gap.
Gap duration: 14.5 h · Distance between observations: 0 km · Implied average speed: 0 kn
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AIS gap
No further position was observed for the detection interval in an area with established AIS reception. This observation does not establish why the signal was lost.
Last signal before gap: 2026-09-26 07:16:48 UTC · Reception in preceding 24 h: 20 h · Last reported speed: 0 kn
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Signal returned
A position was observed after a prolonged AIS gap. The recorded distance is between the last and returning observations, not a known route through the gap.
Gap duration: 15.6 h · Distance between observations: 0 km · Implied average speed: 0 kn
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AIS gap
No further position was observed for the detection interval in an area with established AIS reception. This observation does not establish why the signal was lost.
Last signal before gap: 2026-09-25 15:37:59 UTC · Reception in preceding 24 h: 22 h · Last reported speed: 0 kn
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Signal returned
A position was observed after a prolonged AIS gap. The recorded distance is between the last and returning observations, not a known route through the gap.
Gap duration: 222.4 h · Distance between observations: 159.3 km · Implied average speed: 0.4 kn
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AIS gap
No further position was observed for the detection interval in an area with established AIS reception. This observation does not establish why the signal was lost.
Last signal before gap: 2026-09-16 00:26:15 UTC · Reception in preceding 24 h: 20 h · Last reported speed: 11.9 kn
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Signal returned
A position was observed after a prolonged AIS gap. The recorded distance is between the last and returning observations, not a known route through the gap.
Gap duration: 6.3 h · Distance between observations: 131 km · Implied average speed: 11.3 kn
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AIS gap
No further position was observed for the detection interval in an area with established AIS reception. This observation does not establish why the signal was lost.
Last signal before gap: 2026-09-15 12:09:17 UTC · Reception in preceding 24 h: 24 h · Last reported speed: 9.5 kn
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Signal returned
A position was observed after a prolonged AIS gap. The recorded distance is between the last and returning observations, not a known route through the gap.
Gap duration: 13.8 h · Distance between observations: 315.1 km · Implied average speed: 12.4 kn
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AIS gap
No further position was observed for the detection interval in an area with established AIS reception. This observation does not establish why the signal was lost.
Last signal before gap: 2026-09-14 11:48:55 UTC · Reception in preceding 24 h: 18 h · Last reported speed: 12 kn
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Signal returned
A position was observed after a prolonged AIS gap. The recorded distance is between the last and returning observations, not a known route through the gap.
Gap duration: 11.4 h · Distance between observations: 245.8 km · Implied average speed: 11.6 kn
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AIS gap
No further position was observed for the detection interval in an area with established AIS reception. This observation does not establish why the signal was lost.
Last signal before gap: 2026-09-14 00:20:54 UTC · Reception in preceding 24 h: 24 h · Last reported speed: 12.1 kn
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Signal returned
A position was observed after a prolonged AIS gap. The recorded distance is between the last and returning observations, not a known route through the gap.
Gap duration: 15.7 h · Distance between observations: 358.3 km · Implied average speed: 12.3 kn
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Signal returned
A position was observed after a prolonged AIS gap. The recorded distance is between the last and returning observations, not a known route through the gap.
Gap duration: 8 h · Distance between observations: 184.2 km · Implied average speed: 12.5 kn
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AIS gap
No further position was observed for the detection interval in an area with established AIS reception. This observation does not establish why the signal was lost.
Last signal before gap: 2026-09-11 12:39:17 UTC · Reception in preceding 24 h: 24 h · Last reported speed: 12.6 kn
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Vessel encounter
The tracker observed two vessels staying close together for a sustained interval in relatively quiet surroundings.
First observation: 2026-09-10 21:51:48 UTC · Last close observation: 2026-09-10 22:23:18 UTC · Observed duration: 31 min
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Signal returned
A position was observed after a prolonged AIS gap. The recorded distance is between the last and returning observations, not a known route through the gap.
Gap duration: 6.8 h · Distance between observations: 136 km · Implied average speed: 10.7 kn
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AIS gap
No further position was observed for the detection interval in an area with established AIS reception. This observation does not establish why the signal was lost.
Last signal before gap: 2026-09-10 07:24:52 UTC · Reception in preceding 24 h: 23 h · Last reported speed: 12.9 kn
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Signal returned
A position was observed after a prolonged AIS gap. The recorded distance is between the last and returning observations, not a known route through the gap.
Gap duration: 38.6 h · Distance between observations: 810.1 km · Implied average speed: 11.3 kn
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AIS gap
No further position was observed for the detection interval in an area with established AIS reception. This observation does not establish why the signal was lost.
Last signal before gap: 2026-09-08 06:01:31 UTC · Reception in preceding 24 h: 24 h · Last reported speed: 12.4 kn
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Vessel encounter
The tracker observed two vessels staying close together for a sustained interval in relatively quiet surroundings.
First observation: 2026-09-05 18:12:18 UTC · Last close observation: 2026-09-05 20:02:18 UTC · Observed duration: 110 min
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Reported draught change
The draught entered in the AIS report changed. This can be consistent with a cargo operation, but AIS draught is manually reported and is not a direct measurement.
Previous reported draught: 9.8 m · New reported draught: 8.2 m · Reported draught difference: -1.6 m
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Vessel encounter
The tracker observed two vessels staying close together for a sustained interval in relatively quiet surroundings.
First observation: 2026-09-05 16:34:22 UTC · Last close observation: 2026-09-05 17:10:22 UTC · Observed duration: 36 min
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Vessel encounter
The tracker observed two vessels staying close together for a sustained interval in relatively quiet surroundings.
Observed duration: 62 min · Closest observed separation: 49 m · Both vessels slow: 0 min
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Vessel encounter
The tracker observed two vessels staying close together for a sustained interval in relatively quiet surroundings.
Observed duration: 241 min · Closest observed separation: 42 m · Both vessels slow: 0 min
Recorded identity changes
Latest 0 detected changes, up to 50. This is a record of changes seen by the tracker, not a complete registry history. The IMO page stays the same when a name or MMSI changes.
No identity changes have been recorded by the tracker.