Are you hitting laps each time you stop? If not then no matter what it will be off. It does not sound like it since you did 1600. Just make sure every time you stop you hit the lap button and then hit again to start

Yes, always hit lap after each lap. Did two swims of 10x50, 5x100, 10x50, one with 6.20 fw and the other with 7.10 fw. The 7.10 fw as above missed about 15 lengths. Sometimes one length per lap, others two lengths per lap. Nothing else changed between the swims, same stroke type and push off's. Only thing to change was watch fw!

Do you do flip turns?

That is weird. Have you called Garmin they are super cool and have great customer service. If the initial people don't seem like they know what is going on try a supervisor

I have an Ambit 3 and it works surprisingly well. Do you have to "learn" each of your strokes on the Garmin? If so, maybe after the update you need to relearn it. I know if I take a very long streamline off the wall, it will think I stopped. Also if on a longer swim I pause at all, it will add a lap. Other that not being very precise with lap splits because of the lag to decide if I stopped or flipped, it's pretty well dialed in. A clock still works best for pool swimming overall with intervals IMO, unless you use a countdown interval timer.

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I have only had one short swim on the new firmware but no issues yet. 1500m in a 25m pool, no lengths missed, all metrics look good.

Did you verify you are using the correct pool size?

Yes, checked the pool size prior to swimming with updated fw.

Ive opened a ticket with support and also have reset the watch. Hopefully tomorrows swim with 7.10 will be much better.

I've had the same problems. Lots of missed laps. The best advice is to focus on a good streamline off each wall and wear the watch on the opposite arm you start your stroke with. Regardless of focusing on that when I pick up my pace it always miscounts.

Had a club pool swim last night in which few had a 920XT on 7.10 fw, some had issues, some did not. My watch missed 19x 25m lengths from 1900m. Previously in this pool and same kind of sets it would only miss maybe 2 lengths with previous fw. Nothing else has changed, same stroke, same push off the wall, watch on same arm.

I'm going to throw on the 6.26 beta fw and see whats that like.

Yeah mine missed 9 out of 120 lengths in my 3000m swim on Monday.

I just updated this morning, and the watch missed a length for the first time I've used it since November. It also mis-classified my freestyle as breaststroke.

Haha, maybe your stroke..... needs some work?

Mine is losing in open water. Me and a friend swam 1000yd Sunday, mine recorded 1003 and his recorded 1063, I beat him there by 2 mins and he had a faster time? That's twice its happened. seems to do the same thing in the pool, my times are off.

I wondered what was up with mine. At one point this morning, I counted 2,450 SCY on the board and my 920XT showed 1,975.

Great update, huh? It was always really accurate, before.

They have obviously changed something. It is crazy at this point in the development cycle that they are introducing issues, it has been incredibly stable for a long time. I guess I am lucky or maybe I just swim in a way that it is not exposing the issue, but I have had two swims on the new firmware and haven't missed anything yet.

I have had my 920XT since Dec 2015 it's currently on 6.2 and it hasn't missed a length yet.

I don't plan on updating until they fix this issue.

Do you have it set with the rest interval timer? I have the Garmin Swim but I know I have to hit the lap button twice between intervals, once to "stop" and initiate the rest interval, and another to "start" the next interval.

That is probably a stupid suggestion, sorry.

Interesting! Im using the 910 and its been very reliable for the 4 years until the past couple days where it started missing laps. I havent updated the FW so not sure what happened.

Yeah I lost 450M on my last 4k swim with the new firmware as well. Previous on 6.20 it was rock solid.

I've done 2 or 3 pool swims with 7.1. No missed laps. No problems.

Missed 25 meters on my swim tonight.

Mine just froze twice in the same workout. First time it happens. Will try to rollback to 6.26 or upgrade to 8.03 beta

No problems at all with mine with Software: 7.10.0.0

jaretj