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Swimming as Other activity

Hey guys 

when i swim at see and the other is on, can i trust the gps for counting the km? I’m not sure how much “smart” is the algorithm, as my both hands goes back and forth many many times (but not the same way as when running). 
i have an old forerunner 235 and didnt upgrade it or anything. 
hope someone could light this issue for me. 
cheers 

Roni