[USMA:37220] Re: Clive Cussler adventure novels

[J. Ward]

Norman & Nancy Werling wrote: I just began reading "White Death" published in 2003 in which his new hero used the term "fathometer."  Jim Frysinger may be the most likely to know if there has ever been and if there continues to be such an instrument to measure depth. The instrument that uses sonar to measure water depth is usually called a "depth sounder," at least in the U.S.  I have never heard the term "fathometer," but my dictionary says it's a trademark.