The Toolbox for Tide and Ocean Time Series Data

SAK is the workspace that cleans up, converts, and reshapes tide, current, and met-ocean time series — the toolbox teams reach for the moment field data lands, before it goes anywhere else.

Try it Free → See how it works

Whatever you have, whatever you need

Convert moves data between every format SAK supports — CARIS, HYPACK, PACMARÉ, plain text, .tsd — in whichever direction your project needs. Pick a source, pick a target, and Convert handles the rest. No format is a special case, and none is the only way in or out.

Got something that doesn't match a known format? Advanced Import takes free-form files too.

Core Utilities

The tools your team reaches for every day

Three utilities cover most of what a field dataset needs before it's ready to hand off.

Resolution, on your terms

Change a series' sampling rate to whatever your project calls for — 1 second down to 1 minute, or up to hourly — by typing the interval yourself. No fixed presets, no re-export because the default didn't fit.

New interval — set by you

1min 10min 1h any value

Strategy — your choice

Interpolate Nearest, with tolerance Aggregate (mean)

You set the interval and pick the strategy — nothing pre-set.

One station, one continuous history

Join sequential files from the same station or sensor into a single uninterrupted series. Overlapping timestamps are resolved with one clear, predictable rule — the first file always wins — so nothing is silently duplicated or dropped.

Concatenate — sequential files from one station, joined into a single history.

Five sensors, five clocks, one dataset

Tide, current, wind — whatever you're tracking, it usually lands in its own file, on its own clock, at its own sampling rate. Merge pulls up to 5 of them together and reconciles everything onto a single shared timeline in one pass — the multi-sensor dataset that used to take an afternoon of manual alignment now takes seconds.

Merge — three sensors, three clocks, one synchronized series.

And More

Seven more utilities, same workspace

Diagnostics, text extraction, temporal consistency, precise trims, and unit/datum correction — the rest of the pipeline, all in one place.

Inspect

Quick report on any text file: structure, delimiter, columns — plus quality stats if it's already .tsd.

Find & Replace

Replace text in any raw file — literal or regex.

Extract

Pull values out of text that isn't cleanly tabular — embedded in free-form lines, fixed-width, or at a variable position.

Time Organizer

Reorder, fill timestep gaps, and resolve duplicate timestamps.

Trim

Cut a series down to a specific start and end — down to the minute, not just the date.

Scale

Apply a multiplier and offset to a variable — unit conversion, datum shifts.

Split

Split a large file into N parts by date.