I've got a spare Navman Fish 4150SX unit here, which will offer everything you're looking for. It has a Mono screen, around 4", with a decent fishfinder display, with depth shown in metres or feet and a speed reading too, via the paddle wheel on the transducer. It also has a log feature where you can keep a note of running hours, etc.
Unit is around 5 years old and the transducer was new last year - only used for a couple of hours max.
It comes with a mounting bracket which tilts and swivels, or it can be easily flush mounted.
PM me if it's of interest to you.
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