For longer deployments

The longer housing is the new standard version and can be built to take either rechargeable lithium batteries or D-cells.

The rechargeable lithium batteries run for 7+ months or 14 months if logging alternative minutes. Battery changes must be done ashore.

Both versions can be built to take D-cells, which can be alkaline or primary llithium cells. On alkalines the running time is 4-5 months, or 8 months on primary lithiums.

Polypropylene housing.

Depth:  100m (or more for older PODs)

Easier for deployments by fishers on nets

6 weeks continuous running time

4 alkaline D-cell battery pack

Polypropylene housing.

Depth:  150m

For depths to 2000m

Heavy aluminium housing, as shown. This is supplied with a thick silicone sheath to prevent any metal:metal contacts when deployed.

Battery options are D-cells, which can be alkaline or primary lithium cells. On alkalines the running time is 4-5 months, or 8 months on primary lithiums, and can be nearly doubled by logging alternate minutes - as with all current F-POD versions.

This old C-POD is still working normally with a very good calibration result after 15 years of use.

C-PODs are no long manufactured, but are still in use and there is a supply of replacements as they are released from projects converting to F-PODs.

This pack takes 25 rechargeable lithium 21700 cells.

With 5Ah cells the running time, logging alternate minutes, is 14 months, allowing year long deployments.

To meet vessel safety standards lithium packs should not be changed at sea. They are in 5 stacks that have overload and diode protection against cells being inserted the wrong way round.

Cells must be bought locally.

This integral acoustic release will be available in 2025. It will fit as an alternative to the normal lid on enabled standard F-PODs.

Each POD has its own acoustic release code that is sent by a deck unit and actuates the release which has a 160kg breaking strain line for retrieval of the anchor.

A default release date can be set in the POD before deployment, so the POD would release and remain tethered by the retrieval line. This option can be used without a deck unit.

If the batteries are failing release is forced so that it does not become inaccessible.

The different hardware versions of the F-POD all have the same hydrophone and the same main circuit board and pre-amplifier board.

The significant differences are in size, running time, and battery types.