No matter which system you use to pay your contributions, you'll need to update the USI from Maritime Super to the Hostplus USI for all members who were previously Maritime fund members:
Hostplus USI: HOS0100AU
Hostplus ABN: 68 6574 958 90
If you were an existing Hostplus employer, you’ve kept your current Hostplus employer number and, if applicable, your current QuickSuper login details. You will, however, need to update superannuation fund information for all employees who received contributions into Maritime Super to reflect their new status as Hostplus members.
If you don’t update the USI, then you may face delays with payment, including payments being potentially rejected and returned to you.