SeaLogCressi
How to import dives from a Cressi Leonardo 2.0
The Cressi Leonardo 2.0 exists in both a wired and a Bluetooth LE generation. Try the wireless download first, and if your unit never appears, the cable route further down brings the same dives across.
Download dives from the Cressi Leonardo 2.0
- Wake the computer and put it in transfer mode
Charge or wake the Cressi Leonardo 2.0 and open its Bluetooth or PC/upload mode. Most models only advertise for a minute or two, so do this last, right before you pair.
Most units only hold this mode for a minute or two, so do it last, right before you connect. - Open the import hub in SeaLog
In SeaLog, tap the plus button, then Import dives, then Dive computer. Allow Bluetooth when iOS asks. SeaLog never asks for a manufacturer account.
- Pick your model and pair
Choose Cressi Leonardo 2.0 from the list. If iOS shows a pairing prompt, accept it. Keep the computer in transfer mode until the download finishes.
The unit only advertises for a short window. If it never appears, put it back into transfer mode and try again straight away. - Download the dives
SeaLog pulls every dive still in the computer's memory, with depth profile, water temperature, gas and surface interval, and skips the ones you already have.
- Check and keep
New dives land in your logbook ready to name, place on a site and tag with the species you saw. Nothing was retyped.
If it never shows up: the cable route
The wired generation of the Leonardo 2.0 has no radio at all, so there is nothing to pair with. It goes through a computer once, and after that you can log straight into SeaLog on the boat.
- 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 Leonardo 2.0. 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 Leonardo 2.0 to a Mac or PC
Use the serial cable made for the Cressi Leonardo 2.0, 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 Leonardo 2.0 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 Leonardo 2.0
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 Leonardo 2.0: common questions
Does the Cressi Leonardo 2.0 have Bluetooth?
It depends on the generation. This model line was sold in both a wired version and a later Bluetooth LE version, and they look almost identical. The quickest way to find out which one is on your wrist is to try the Bluetooth download first: if the computer never shows up while it is in transfer mode with a fresh battery, yours is the wired one and the cable route below is the way in.
Why will my Cressi Leonardo 2.0 not connect over Bluetooth?
Nine times out of ten the computer has dropped out of transfer mode: it only advertises for a short window, so put it back into Bluetooth or upload mode and try again immediately. After that, check that the battery is not low, that no other app or desktop is already holding the connection, and that Bluetooth permission is granted to SeaLog in iOS Settings. Toggling iOS Bluetooth off and on clears a stale pairing more often than it should.
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.
Does the depth profile come across, or just the numbers?
The full profile. SeaLog stores the sample-by-sample depth, temperature and ascent data, draws it as a graph you can scrub, and can export the whole thing back out to UDDF at any time.