Deploying instruments in the water that you want to retrieve but don’t want to advertise them with a surface presence? Try going to the PUB (MSI Pop-Up Buoy, that is). Mooring Systems Inc have now made the original available with the new R500 acoustic release from Teledyne Benthos. This has improved battery life and status reporting as well as being controllable from a low cost deck-box.
MSI have also introduced the PUB-deep, with a canister capacity of 500m of rope (so deployable to 330m with 50% line allowance for current drag). You can find the new data sheet here: