SeaLogDive computer sync
How to import dives from a Halcyon dive computer
2 of the 2 Halcyon models in the catalog download straight to an iPhone over Bluetooth. Pick your exact model below for the steps that apply to it.
Halcyon models that sync over Bluetooth
SeaLog pairs with these directly. No cable, no desktop software, no manufacturer account. Where a model line was sold in both a wired and a wireless generation, its page covers both routes.
Halcyon downloads, drivers and manuals
Alive and current. The Symbios is Halcyon's active dive-computer ecosystem, with its own documentation site, published firmware, and a first-party app on both stores.
Desktop software
- Desktop softwareHalcyon Dive Systems app for iOSFirst-party app for configuring the computer, reviewing dive logs and applying firmware over Bluetooth.iOS
- Desktop softwareHalcyon Dive Systems app for AndroidThe Android build of the same app.Android
- Desktop softwareSubsurfaceAlready supports both Symbios devices.Win + Mac
Official guide
- Official guideCharging and USB connection (online manual)States plainly that the handset shows up as a logical drive on the PC and can be browsed like a USB stick.Win + Mac
- Official guideDive data storage (online manual)Confirms 32 GB of storage at five-second sampling, reachable over USB mass storage or Bluetooth 5.0.Win + Mac
- Official guidePairing (online manual)The Bluetooth pairing procedure.Win + Mac
- Official guideFirmware update (online manual)Warns to charge fully first and that decompression information and settings may be cleared by an update.Win + Mac
Firmware
Manual
- ManualSymbios Handset manual (PDF)Full handset manual, November 2025 revision.
- ManualSymbios HUD manual (PDF)February 2026 revision, the newest document on the site.
- ManualSymbios Tank Pod manual (PDF)For the wireless pressure transmitter.
- ManualSymbios CCR Pod manual (PDF)For the closed-circuit monitoring pod.
Support
Worth knowing
- Two independent ways off the device. Mass storage over USB, or Bluetooth 5.0 to the Halcyon app. And neither needs a proprietary desktop driver.
- 32 GB of storage at five-second sampling means the handset holds an unusually deep log history, so a first import can be very large.
- Documentation lives on a separate site, symbios.halcyon.net, not under halcyon.net. The main support page is a JavaScript shell that will not lead a diver to the manuals, so link the Symbios hub directly.
- Manual filenames carry their revision date (Handset RevNov25, HUD RevFeb26), so any deep link will eventually break. Point people at the documentation hub as well as the PDF.
- A firmware update can clear settings and stored decompression information, which is worth flagging before anyone updates mid-trip.
- Polish translations of the Handset, HUD and Tank Pod manuals are also published on the hub.
One logbook for all of it
SeaLog keeps every dive in one place whichever computer it came from, with the depth profile intact, and exports back out to UDDF whenever you want it.