In my opinion, we might be missing the point all together...
Never mind the colour screen, wireless audio, GPS or the mapping,
these are all features which easily fit in that slime control box...
Like everyone noted what stands out is the large battery case and
large battery = large power supply = large power consumption = PI
What if the CTX3030 combines VLF with PI technology?
quote from Bruce Candys US Patent 8063777 of November 22, 2011
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[...] where the operator is able to [...] select different waveforms
[...] examples [...] being time-domain, square-wave, sine wave [...]
if I'm not mistaken, then...
- time-domain .....means PI technology
square-wave ....means multi-frequency technology
sine wave ........means VLF technology
I don't know if above mentioned patent is the one for the CTX3030, but
it would explain the large battery, and as waterproofing would allow salt
water detecting a machine which can be switched to PI if needed would
be better suited...
Back on land you could switch it back to Multi-frequency for
relic hunting, or single VLF, and/or, PI for Gold Prospecting...
Just a thought
--Eddy C.