"marine timekeeper"
by cm
Marine Chronometer, 1796
Creative Commons AttributionMarine Chronometer, 1796 - Credit: cliff1066, flickr
Chronometer, 2009
Permission Granted by Copyright Owner for Use on Book DrumChronometer, 2009 - Credit: Omega
The term “chronometer” is still used to denote a clock on board a boat.   Away from the sea, the word denotes particularly accurate clocks, and in Switzerland only those watches that meet a particular high standard may be labelled “Chronometer”.   Thus a made-up fancy word for a clock has come to have either maritime or precision connotations – or both.