What should I picture when I read 终端？
“北斗系统終端” should be interpreted as any devices such chart plotter, fish finder, handheld gps, vhf radio with built-in gps, gps watch, epirb with gps, mob device with gps, camera with gps.

the list is much longer, with the satellite sms facilities.

if you think of computer terminal only, it’s, well, you’re landbuddy :)

have a look of marine products associated with gps, you’ll have the idea

https://www.fisheriessupply.com/sitesearch.aspx?keyword=gps&amp;sitesearch=true

have fun :)