The Infinium has auto ground tracking ; The Sea Hunter does not have ground tracking.
The Infinium has normal PI discrimination plus duel tone target ID that is mainly for separating high conductivity metal from low conductivity metal : The Sea Hunter has normal PI discrimination and is single tone..
The Infinium is a Motion detector : The Sea Hunter is No Motion.
The Infinium is set up to operate in highly mineralised ground and to ignore most hot rocks that are found in the gold fields. It is a gold detector that has the ability to be adjusted to operate very well on salt water beaches and for scuba work. This detector will function very well anywhere and in all ground conditions.
The Sea Hunter is set up for salt water beach and scuba operation and will be noisy on hot rocks and gold field heavy mineralisation. This is an excellent beach machine
The Infinium can be adjusted to reduce or cancel the effects of external electrical interference : The Sea Hunter can not.
These are the main differences between these two machines.
Cheers,
Adrian SS