from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Plural form of fathometer.
Sorry, no etymologies found.
For several years, when fathometers on ships have been taking depth soundings, they often pick up a false bottom before getting the actual depth.
Shortly afterwards, Loran-C, color fathometers, GPS units and side-scan sonars became available to everyone at a reasonable cost.
Around the mid-1970s, a few boats were equipped with Loran-A and paper fathometers.