Displaying an arbitrary file in _both_ HEX and ASCII

[Richard Owlett <rowlett@cloud85.net>]

I'm running Debian 9.8 with MATE desktop.
I'm exploring a data file with the intention of eventually parsing it in 
a useful fashion.

Just downloaded ghex. I like the display format.
Its tools are inconvenient.

I need to:
 1. Simultaneously display in _both_ HEX and ASCII format
 2. Know the current offset in *DECIMAL* format.
    {knowing the offset also in HEX might be nice}
 3. Goto to an offset - expressed in DECIMAL.
 4. Advance a specific number of bytes.
 5. Search for an ASCII string.
 6. Search for arbitrary sequence of bytes expressed as HEX.

Suggested tool(s) in Debian repository?
TIA