SeaLogCressi
How to import dives from a Cressi Newton
The Cressi Newton 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 Cressi Newton
- 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 Cressi Newton. Install the USB-to-serial IR bridge. libdivecomputer lists the Leonardo-era interface as FTDI (VID 0x0403 / PID 0x87D0) and the older Seiko-based Cressi cable as Prolific PL-2303 re-badged with Cressi IDs (VID 0x04B8 / PID 0x0521). Cressi's own installer bundles a USB-only driver that exposes no COM/tty serial port, which is why third-party software needs the VID/PID grafted onto the generic FTDI or PL-2303 driver. Decompiling Cressi UCI confirms the transport: it drives a plain serial port and speaks an IrDA protocol to the computer. driver, then reboot. Skip this and the desktop app will report no device on a cable that is working perfectly.
libdivecomputer driver reference, including the Cressi VID/PID quirk
These cables are USB-to-serial. Without the USB driver the port never appears, and the software reports no device. - Connect the Cressi Newton to a Mac or PC
Use the serial cable made for the Cressi Newton, 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 USB-to-serial IR bridge. libdivecomputer lists the Leonardo-era interface as FTDI (VID 0x0403 / PID 0x87D0) and the older Seiko-based Cressi cable as Prolific PL-2303 re-badged with Cressi IDs (VID 0x04B8 / PID 0x0521). Cressi's own installer bundles a USB-only driver that exposes no COM/tty serial port, which is why third-party software needs the VID/PID grafted onto the generic FTDI or PL-2303 driver. Decompiling Cressi UCI confirms the transport: it drives a plain serial port and speaks an IrDA protocol to the computer.. - Put the computer into PC mode
Switch the Cressi Newton 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 Cressi Logbook or Subsurface. Subsurface is free, open source, runs on macOS, Windows and Linux, and supports this model.
- 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 Newton
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.
Cressi’s own software and drivers
Alive but frozen: Cressi still sells computers and still hosts every file, but the desktop software has not moved since 2022 (macOS support stops at Catalina, the Mac build is Intel-only), and the range is now split across three unrelated apps and two half-migrated websites.
- Desktop softwareCressi PC Interface 2.0.2.42 (Windows 11)The newest desktop release Cressi has published. Only listed on the legacy software index, not on the current support hub.Windows
- Desktop softwareCressi PC Interface 2.0.2.41 (Windows XP to Windows 10)The older Windows line. Use the .42 build instead if you are on Windows 11.Windows
- Desktop softwareCressi PC Interface 2.0.3.44 (macOS 10.12 Sierra to 10.15 Catalina)The last Mac build of PC Interface. Catalina is the newest system Cressi claims, so Big Sur onwards is unsupported territory.macOS
- Desktop softwareCressi PC Interface 2.0.3.40 (OS X 10.8 to 10.11)Kept for old Macs only. Installing this on a newer system, or the newer one on an older system, yields a build that launches but never talks to the cradle.macOS
- Driverlibdivecomputer driver reference, including the Cressi VID/PID quirkNot a Cressi page, but the only place the chipset story is documented. Cressi ships no standalone driver download; its driver comes bundled in the PC Interface installer and deliberately exposes no serial port, so anything other than Cressi's own software needs the generic FTDI or PL-2303 driver taught the Cressi IDs first.Win + Mac
- Official guideCressi PC Interface 2.0 Instructions Manual (English)The real step-by-step. Chapter 4 walks the Download panel: connect, set PC Link, dock, name the computer, pick a folder, choose dives. Also states plainly that a dive can only be exported as a plain text file.Win + Mac
- Official guideCressi PC Interface installation notes for macOSExplains the full-versus-upgrade package choice, the two-stage pre-installer required on Yosemite and El Capitan, and the unplug-install-reboot-replug order that most failed installs get wrong.macOS
- Official guideCressi PC Interface installation notes for macOS 10.12 SierraCovers the Gatekeeper workaround from Sierra onwards: control-click the disk image and the package and choose Open, since the system no longer offers an allow-anywhere setting.macOS
Every link goes to Cressi’s own site and was checked before publishing. If one has rotted since, tell us and we will fix it.
Cressi Newton: common questions
Can I connect the Cressi Newton to my iPhone directly?
No, and no app can change that. The Cressi Newton 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 Cressi 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.