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UTB said..
Whats the difference between type 2 and type 3 in terms of flotation?
flotation? nothing - it is to do with colours. Type 2 (now called 50) must be red/yellow - type 3 (now called 50s) can be anything.
PFDs made to AS 4758 are marked as –
Level 150 – which is similiar to inflatable PFD Type 1 and suitable for offshore use
Level 100 – which is similiar to PFD Type 1 and the minimum requirement for offshore use
Level 50 – which is similiar to PFD Type 2
Level 50 Special Purpose (50s) – to replace PFD Type 3
and some more copy/paste....
* A PFD Type 1 is designed to keep you in a safe "face up" floating position. There are two types – fixed buoyancy and those which are self or manually inflatable. It can be worn for general boating in all waters.
* A PFD Type 2 or buoyancy vest has less buoyancy than a PFD Type 1 and may not rotate you to a "face up" floating position. Normally used for sailing, waterskiing, kayaking, canoeing, wind surfacing and on personal watercraft.
* A PFD Type 3 Has similiar buoyancy characteristics as PFD Type 2 but is manufactured in a wider range of colours. Favoured by waterskiers and PWC riders, it is also available as a built in garment (eg waterskiing wet suit).