SeaLogCochran
How to import dives from a Cochran EMC-20H
The Cochran EMC-20H transfers over serial cable only. iOS does not expose that kind of connection to apps, so the dives come across once through a Mac or PC, then live on your phone forever.
Transfer the dives off the Cochran EMC-20H
- Install the driver for the cable
The serial cable is a USB-to-serial adapter, and its chipset needs a driver before any software can see the Cochran EMC-20H. Install the RS-232 serial (Cochran's own interface cable is plain serial, with no USB bridge chip) driver, then reboot. Skip this and the desktop app will report no device on a cable that is working perfectly.
These cables are USB-to-serial. Without the RS driver the port never appears, and the software reports no device. - Connect the Cochran EMC-20H to a Mac or PC
Use the serial cable made for the Cochran EMC-20H, not a generic charging cable: the data pins differ. Check the o-ring is seated, line the connector up with the notch on the case, and turn it to lock. An iPhone or iPad cannot open this kind of connection at all, so this step has to happen on a computer.
The o-ring must be in place, the nub lines up with the notch, then the head turns a quarter turn to lock. This cable is RS-232 serial (Cochran's own interface cable is plain serial, with no USB bridge chip). - Put the computer into PC mode
Switch the Cochran EMC-20H into its PC or upload mode before you launch the software, not after. Most desktop apps only look for the unit at startup, so a computer that wakes up late is a computer the software never finds.
Most units only hold this mode for a minute or two, so do it last, right before you connect. - Download the dives with desktop software
Read the computer with Subsurface, or your manufacturer's own desktop software. Subsurface is free, open source, runs on macOS, Windows and Linux, and supports this model.
cochran. Open-source tool that talks to and parses Cochran dive computers
- Export the dives as UDDF
Export the whole logbook to a UDDF file. UDDF is the open dive-log exchange format and keeps the full depth profile, not just the summary numbers.
Export the whole logbook, not the visible page. UDDF keeps the sample-by-sample depth profile, which a summary CSV does not. - Import the file into SeaLog
Get the file to your phone. AirDrop, iCloud Drive or email all work, anything that lands it in the iOS Files app. Then in SeaLog tap the plus button, Import dives, UDDF file, and pick it. Every dive arrives with its profile, and duplicates are skipped.
A dive log app for the EMC-20H
Once the dives are in, SeaLog treats them like its own: a scrubbable depth profile, the site pinned on a map, water temperature, gas and tank, buddies, and the photos from your camera roll matched to the minutes you were underwater. Tag the animals you saw and they go into your species life list. It works offline on the boat and syncs when you are back, and your whole logbook exports to UDDF, CSV or PDF whenever you ask, so nothing is locked in here either.
Cochran’s own software and drivers
Dead. Cochran Undersea Technology wound up after founder Mike Cochran died in 2018; there is no vendor site, no downloads page and no way to obtain or license Analyst any more.
- Desktop softwarecochran. Open-source tool that talks to and parses Cochran dive computersWritten precisely because Analyst was Windows-only; downloading works, changing settings is still incomplete.Win + Mac
- Desktop softwareSubsurface. Desktop logbook whose libdivecomputer backend still drives Cochran hardwareRealistic replacement for Analyst on any modern OS.Win + Mac
- Official guideRunning the old Analyst software under WineWin + Mac
- SupportSubsurface list confirming which Cochran models can still be downloadedCommander I/II/TM and EMC-14/16/20H are covered.Win + Mac
Every link goes to Cochran’s own site and was checked before publishing. If one has rotted since, tell us and we will fix it.
Cochran EMC-20H: common questions
Can I connect the Cochran EMC-20H to my iPhone directly?
No, and no app can change that. The Cochran EMC-20H transfers over serial cable only, a connection iOS does not expose to apps. Anyone promising a direct wireless download from this model is describing a different computer. The one-time cable route above gets every dive across.
Which cable and drivers do I need on a Mac?
Use the Cochran interface cable made for this model, not a generic charging cable: the data pins differ. Most of these cables are USB-to-serial and need the driver for their chipset on macOS, usually Silicon Labs CP210x or FTDI. Install the driver, reboot, and the port appears to the desktop software.
Do I have to do this every time I dive?
Only if you want the new dives in digitally. Many divers do the cable run once to rescue their history, then log new dives directly in SeaLog on the boat, which takes about as long as filling in a paper page.