Do I have several GPSs, or several GPSes, or something completely different? What is the rule to remember (will be useful later when I can have a GPS2, a GPST and maybe a GPSX too).

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    The short answer is that you own several GPSes. The people who write GPS’s tend to get talked about, and not in a good way. – tchrist Jul 15 '13 at 12:40