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Lap counting almost doubles my actual laps in a 25 yard pool

I have been using a Forerunner 735XT to keep track of my laps while swimming in a 25-yard pool for about five years. Recently my wife began using a Garmin Swim II to keep track of her laps swimming in the same 25-yard pool. She has also been counting her laps to check the accuracy of the watch. The watch adds several laps each swim. I swim 1.5 hours three times per week without rests, stops, with a good flip turn and only use freestyle. The 735XT reports that I am swimming between 3.2 and 3.4 miles each swim. After learning about my wife's watch's inaccuracy I have begun counting laps as well and find that I am only swimming 1.75 to 2.0 miles each session. Who else has experienced this problem and what did you do to correct it? I have followed the instructions from Garmin and updated to version 9.80, but so far nothing has helped.

0 Andy275 over 3 years ago

Make sure you set the pool length to 25yds. Also, it counts based on accelerations/deccelerations. If you suddenly slow down because someone is in front of you or if you speed up to pass, it will register as a new lap. Check the length times to see if they are generally uniform. Short times in between indicate a false lap detection.

0 Jim Liner over 3 years ago in reply to Andy275

Thanks, Andy. The length times are not uniform on the intervals graphical chart. I'm thinking the problem is with the watch. I haven't had to share a lane in years. After a flip turn I glide about two body lengths before taking another stroke, maybe this glide is the problem? According to the watch some pool lenghs are done in 12-18 seconds, others 30-42 seconds.

0 tmk2 over 3 years ago in reply to Jim Liner

Jim Liner said:
maybe this glide is the problem?

A 1-second glide worked for me 100%.

Make sure that you observe all the suggestions here:

https://support.garmin.com/en-US/?faq=iS2KcmGiVb4djrE1lri8i7

If you still don't get accurate length count, then perhaps indeed there something wrong with the watch.

0 Andy275 over 3 years ago

The new lap is triggered by a firm push off. Do you know your normal (expected) time per lap? In theory if you pushed off and then glided you to a a point where you slow down and the accelerate with your first stroke that could trigger an extra length. I am guessing that is not 12-18 sec though. I flip, push off hard and then almost immediately take 3 butterfly kicks to get as much distance as possible before I take my first stroke with my non=watch hand. The counts are generally 100% correct unless I encounter an interruption. Play around with your push offs, which hand you wear your watch and the suggestions in the link by tmk2. Good luck.