This thread seems to have people that got Maxsea 10 working with a USB GPS device:
maxsea10 cannot fined the GPS
The only other suggestions I found for using USB GPS devices is to upgrade to Maxsea 12, but that's a pretty good chunk of money to do that
I did search but never saw that thread before!
I was trying to avoud using a physical USB to Serial Adapter.
In Maxsea GPS setup screen there are only setting for serial ports, COM1 to 7. Having spent hours on it on my old laptop and having spoken to Maxsea agent . . . IT WILL NOT SEE anything other than a COM port or a virtual COM port. So it's no good just plugging in a Bluetooth or USB GPS UNLESS there is and external converter + software to fool it.
On the Asus, as there are no real serial ports, when you go into GPS settings, everything is "Greyed out". I've installed "USB Virtual Com" utility and pointed VCOM1 to a USB port. Now within Maxsea, all those COM settings are active and all the other parameters can be set. Arrrrh . . . bad new, I sold
my old Garmin
12 (serial) and have not yet purchased a replacement USB GPS!
The screen on the 900 maybe a bit smaller than some chartplotters etc but it is very "Sharp" and nice and bright. I will use my Asus inside the cabin
only and BUT may add an ex "Point of Sale" monitor
10" or 12" for use at the helm!
PS: Maxsea 12 . . . megga$$$ as I have charts
for the whole world and they won't run in the new version of Maxsea!