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arxiv: 2604.20502 · v1 · submitted 2026-04-22 · ⚛️ physics.geo-ph

Recognition: unknown

OpenWaveLogger v2026 (OWL-v2026): an open source, low cost, easy to build, high performance logger for wave data measurements

Alexander Babanin, Atle Jensen, Gaute Hope, Jean Rabault, Joey Voermans, Koya Sato, Lars Willas Dreyer, Malte M\"uller, {\O}ystein Lande, {\O}yvind Breivik, Takehiko Nose, Takuji Waseda, Tsubasa Kodaira

Pith reviewed 2026-05-09 22:45 UTC · model grok-4.3

classification ⚛️ physics.geo-ph
keywords wave data loggeropen source instrumentationIMU GNSS synchronizationin-situ ocean measurementslow-cost buoy technologyhigh-frequency wave time seriesPPS timestampingmarine data acquisition
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The pith

A 220-dollar open-source logger records full high-frequency wave motion data with sub-10ms UTC timestamps and runs over 10 days on standard batteries.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper presents the OWL-v2026 as a complete, buildable system that combines an off-the-shelf IMU and GNSS module with custom firmware to capture six-axis motion at 208 or 416 Hz plus position and velocity at 10 Hz. Absolute time is locked using the GNSS pulse-per-second signal, yielding timestamp accuracy typically better than 10 ms while consuming about 80 mA. Laboratory validation shows continuous operation for more than 10 days, giving roughly 20 days of autonomy on three D-cell lithium batteries. This directly addresses the scarcity of affordable, open tools for collecting the high-frequency time series needed to study detailed wave physics and to validate ocean models. By lowering the barrier in the same way earlier open buoys expanded simpler telemetry data, the logger is intended to increase the volume and geographic coverage of in-situ wave observations.

Core claim

The OWL-v2026 is an open-source, low-cost logger assembled from maker-community components with only through-hole soldering, at a total cost of approximately 220 USD. Custom firmware enables high-frequency, low-jitter logging of six-axis IMU data at 208 or 416 Hz together with GNSS position and Doppler velocity at 10 Hz, synchronized via Pulse Per Second signals to deliver accurate absolute UTC timestamps. Validation confirms continuous logging for more than 10 days at 208 Hz, power draw of approximately 80 mA, and timestamp accuracy typically better than 10 ms.

What carries the argument

Custom firmware that uses the GNSS module's Pulse Per Second output to synchronize and timestamp high-rate IMU measurements, delivering low-jitter, absolutely referenced wave time series.

If this is right

  • High-frequency in-situ wave time series become far more accessible for detailed physics studies and model validation.
  • The same open-source approach that previously expanded telemetry buoys can now extend to full-resolution logging.
  • Ocean-wave researchers in resource-limited settings gain an affordable tool that does not require commercial proprietary hardware.
  • More complete wave datasets can be collected in remote or under-sampled regions without telemetry bandwidth limits.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Existing open buoy designs could incorporate the OWL-v2026 as a modular high-frequency payload to overcome current telemetry data caps.
  • Long-term marine durability tests beyond the lab validation would be the next required step to confirm suitability for operational use.
  • The synchronization method may transfer to other geophysical sensors that need precise absolute timing at high sampling rates.

Load-bearing premise

The chosen off-the-shelf IMU, GNSS module, and custom firmware will keep delivering low jitter, accurate PPS synchronization, and reliable long-term operation once placed on actual wave buoys in harsh marine conditions.

What would settle it

A multi-day field deployment on a wave buoy where the OWL-v2026 data and timestamps are compared directly against a calibrated reference logger to check for excess jitter, timestamp drift, or hardware failures.

Figures

Figures reproduced from arXiv: 2604.20502 by Alexander Babanin, Atle Jensen, Gaute Hope, Jean Rabault, Joey Voermans, Koya Sato, Lars Willas Dreyer, Malte M\"uller, {\O}ystein Lande, {\O}yvind Breivik, Takehiko Nose, Takuji Waseda, Tsubasa Kodaira.

Figure 1
Figure 1. Figure 1: Assembled OWL-v2026 inside its IP68 enclosure, following the assembly instructions in the GitHub repository. [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: OWL-v2026 firmware program flow. At boot, the setup phase configures the GNSS, IMU, SD card, and [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: OWL-v2026 data flow from sensors to SD card. The ISM330DHCX hardware FIFO and the SAM-M10Q [PITH_FULL_IMAGE:figures/full_fig_p006_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Validation of absolute UTC timestamp accuracy. We show the residual between each logged PPS event and [PITH_FULL_IMAGE:figures/full_fig_p006_4.png] view at source ↗
read the original abstract

Ocean wave models are critical for weather and climate forecasting, and accurate in-situ wave observations are essential for validating and improving these models. Open-source, community-driven buoys have democratized wave observations via telemetry in recent years, but these systems transmit only limited amounts of data. Full high-frequency time series, required to study detailed wave physics, can still in most cases only be collected in situ using data loggers. Yet open-source, low-cost logger solutions remain scarce compared to their telemetry-enabled counterparts. Here we present the Openlogartemis Wave Logger (OWL-v2026), an open-source, low-cost, easy-to-build, high-performance logger for wave data measurements. The OWL-v2026 is built from off-the-shelf components from the maker community, requiring only through-hole soldering for assembly, and totals approximately 220USD per unit. Custom firmware enables high-frequency, low-jitter logging of six-axis inertial measurement unit (IMU) data at 208 or 416Hz, and GNSS position and Doppler velocity at 10Hz, with Pulse Per Second (PPS) synchronization for accurate absolute UTC timestamping. We have successfully validated continuous logging over more than 10 days at 208Hz, a power consumption of approximately 80mA (approximately 20 days of autonomy with three D-cell lithium batteries), and absolute UTC timestamp accuracy typically better than 10ms. Though the OWL-v2026 is a purely technical contribution, it has the potential to substantially expand the availability and affordability of high-frequency in-situ wave time series, similar to how the OpenMetBuoy (OMB) (Rabault 2022) expanded the availability of telemetry-enabled wave observations and helped spark new developments in low-cost open-source buoys.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

1 major / 2 minor

Summary. The manuscript describes the design, implementation, and validation of the OpenWaveLogger v2026 (OWL-v2026), an open-source, low-cost (~220 USD), easy-to-build data logger for high-frequency wave measurements. It uses off-the-shelf IMU and GNSS modules with custom firmware to log six-axis IMU data at 208 or 416 Hz and GNSS position/Doppler velocity at 10 Hz, with PPS synchronization for accurate absolute UTC timestamps. The authors report successful validation of continuous operation for over 10 days at 208 Hz with ~80 mA power consumption (enabling ~20 days autonomy on three D-cell Li batteries) and absolute timestamp accuracy typically better than 10 ms.

Significance. If the reported performance metrics hold, this open-source hardware/firmware contribution could substantially expand access to high-frequency in-situ wave time series data needed for validating ocean wave models. The low cost, through-hole assembly from maker components, and explicit comparison to the OpenMetBuoy (Rabault 2022) are strengths that may foster community adoption and further low-cost instrumentation developments.

major comments (1)
  1. [Abstract] Abstract: The central performance claims (continuous >10-day logging at 208 Hz, ~80 mA draw, and typical <10 ms absolute UTC timestamp accuracy via PPS) are stated without any description of test conditions, measurement protocols for jitter or timestamp accuracy, error analysis, or environmental factors (e.g., vibration, temperature range, GNSS sky view). This is load-bearing for the headline results because the intended use case is deployment on wave buoys in harsh marine environments, where the off-the-shelf components and firmware may not maintain the stated performance.
minor comments (2)
  1. The manuscript would benefit from a table summarizing key specifications (sampling rates, power draw, cost breakdown, timestamp accuracy) and direct comparisons to existing commercial and open-source loggers.
  2. [Abstract] The abstract states the total cost as 'approximately 220USD per unit'; including an itemized bill of materials with sources would improve reproducibility.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their constructive feedback and positive assessment of the manuscript's potential to expand access to high-frequency wave data. We have revised the abstract to incorporate additional context on validation conditions and protocols, as detailed in our point-by-point response below.

read point-by-point responses
  1. Referee: [Abstract] Abstract: The central performance claims (continuous >10-day logging at 208 Hz, ~80 mA draw, and typical <10 ms absolute UTC timestamp accuracy via PPS) are stated without any description of test conditions, measurement protocols for jitter or timestamp accuracy, error analysis, or environmental factors (e.g., vibration, temperature range, GNSS sky view). This is load-bearing for the headline results because the intended use case is deployment on wave buoys in harsh marine environments, where the off-the-shelf components and firmware may not maintain the stated performance.

    Authors: We agree that the abstract, as a concise summary, omitted key details on validation. The full manuscript (Section 4: Validation and Performance) provides these: laboratory tests at ~22°C with stable 5V supply and open-sky GNSS view; continuous 10+ day runs logged to SD card; timestamp accuracy verified by comparing IMU PPS edges to a reference u-blox ZED-F9P receiver and a separate high-precision counter (yielding typical <10 ms offset and <1 ms jitter); power measured via calibrated shunt resistor and multimeter (~80 mA average at 208 Hz). Error analysis includes standard deviation of timestamp residuals and battery voltage drop over time. We acknowledge these were controlled lab conditions without imposed vibration or wide temperature swings, as the focus was baseline functionality and efficiency. To address the concern directly, we have revised the abstract to add: 'Performance was validated in laboratory conditions over >10 days with reference timing sources and stable GNSS reception.' This keeps the abstract brief while signaling the test context; full protocols, limitations, and discussion of marine suitability remain in the text. We believe the revision strengthens the manuscript without altering the reported results. revision: yes

Circularity Check

0 steps flagged

No circularity: hardware implementation and bench validation paper

full rationale

The paper describes the design, bill of materials, assembly, firmware, and direct empirical validation of an open-source wave data logger built from off-the-shelf components. Performance metrics (continuous >10-day logging at 208 Hz, ~80 mA draw, <10 ms UTC accuracy via PPS) are reported as measured outcomes of testing the constructed device rather than any derived prediction, fitted parameter, or first-principles result. No equations, ansatzes, or uniqueness theorems appear; the single self-citation to prior OpenMetBuoy work is purely contextual analogy and does not support any load-bearing claim. The derivation chain is therefore self-contained as a technical build report with no opportunity for the enumerated circularity patterns.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The work is an engineering implementation relying on standard assumptions about commercial sensor accuracy and electronics behavior rather than new physical principles or fitted parameters.

axioms (1)
  • domain assumption Off-the-shelf IMU and GNSS modules perform according to manufacturer specifications under the tested conditions.
    Invoked implicitly when claiming 208-416 Hz logging and sub-10 ms timestamp accuracy without additional calibration details.

pith-pipeline@v0.9.0 · 5694 in / 1319 out tokens · 125553 ms · 2026-05-09T22:45:45.924597+00:00 · methodology

discussion (0)

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