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735xt stops tracking swim after a while

Over the past few weeks my previously reliable 735xt has started dropping GPS connection midway through my outdoor swims... generally after 4.7k (give or take a few 100m)

This occurs at venues where I’ve previously successfully tracked long swims. And on one occasion I had my watch sitting on top of a tow float for the entire swim yet the same problem occurred.

Its about 18 months old, and is up to date software wise. I’m at a loss as to what to do!

0 Andy275 over 3 years ago

That's odd. I assume nothing in particular happens at the 4.7k mark (stopping, tree cover or cliffs etc.)? I have swum up to 18k (current assist) without issue, but using firmware version 9.40. Maybe there is a bug in the new firmware that limits the distance? Somewhere near that point the watch shifts from yards/meters to miles/km. Maybe a bug when that happens?

0 kizzsmyth over 3 years ago in reply to Andy275

It is indeed odd! There are three different locations I’ve swam at that on earlier swims tracked accurately over 10k, but now stop after ~4.7k... so it’s not as if there is a particular reason for it.

I’m wondering if it is a bug in the firmware? I can’t recall when the last update was applied.

0 Andy275 over 3 years ago in reply to kizzsmyth

If you are at 9.80 2 months ago +/-, but depends on when you may have downloaded it. I have stayed at 9.40 bc the many issues with 9.70. You may want to check which version and see if that can be associated with the timing.

0 kizzsmyth over 3 years ago in reply to Andy275

Yeah I’m on 9.80

Sounds like they haven’t worked out all the bugs from 9.70 just yet

0 Andy275 over 3 years ago in reply to kizzsmyth

Since he watch changes from meters to km around that point, try changing the settings to record in km from the start (just in case). Annoying nonetheless.