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Fitbit sense tracks swimming incorrectly

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I recently got a Sense, and it is useless to track swimming lap.  The table below shows huge variation from the actual swam distance.

 

Does anyone else experience similar problems?

DateDistance calculated manuallyDistance recorded on SENSEDifferenceCoefficient of variation
05-Nov-20                                      1 550                              1 70015010%
06-Nov-20                                      1 550                              1 82527518%
09-Nov-20                                      1 500                              1 90040027%
12-Nov-20                                      1 600                              1 7001006%
13-Nov-20                                      2 050                              2 1501005%
14-Nov-20                                      2 500                              2 75025010%
16-Nov-20                                      1 500                              1 125-375-25%
17-Nov-20                                      1 600                              2 37577548%
18-Nov-20                                      1 700                              1 8001006%
19-Nov-20                                      1 600                              1 7501509%
20-Nov-20                                      1 600                              1 95035022%
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7 REPLIES 7

How has your lap count been? 

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Thank you for your response.
The table shows that the lap count is equally inaccurate and inconsistent.

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Your table only shows distance, not Laps. Most are within 100 and within the 10% error. 

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Apologies, I have not included the laps in the previous table, it is included in the table below.

The big concern is that the variation from the actual is inconsistent.  On one occasion the Device had 48% more laps than actual, an on another it had 25% less than actual

 

Date     

Laps counted manually

Distance calculated manually

Laps counted on sense

Distance recorded on SENSE

Difference

Coefficient of variation

05-Nov-20

                 62

           1 550

                 68

           1 700

150

10%

06-Nov-20

                 60

           1 550

                 73

           1 825

275

18%

09-Nov-20

                 60

           1 500

                 76

           1 900

400

27%

12-Nov-20

                 64

           1 600

                 68

           1 700

100

6%

13-Nov-20

                 82

           2 050

                 86

           2 150

100

5%

14-Nov-20

              100

           2 500

              110

           2 750

250

10%

16-Nov-20

                 60

           1 500

                 45

           1 125

-375

-25%

17-Nov-20

                 64

           1 600

                 95

           2 375

775

48%

18-Nov-20

                 68

           1 700

                 72

           1 800

100

6%

19-Nov-20

                 64

           1 600

                 70

           1 750

150

9%

20-Nov-20

                 64

           1 600

                 78

           1 950

350

22%

25-Nov-20

                 46

           1 150

                 53

           1 325

175

15%

 

 

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Updated table:

Date

Laps counted manually

Distance calculated manually

Laps counted on sense

Distance recorded on SENSE

Difference

Coefficient of variation

05-Nov-20

                 62

           1 550

                 68

           1 700

150

10%

06-Nov-20

                 60

           1 550

                 73

           1 825

275

18%

09-Nov-20

                 60

           1 500

                 76

           1 900

400

27%

12-Nov-20

                 64

           1 600

                 68

           1 700

100

6%

13-Nov-20

                 82

           2 050

                 86

           2 150

100

5%

14-Nov-20

              100

           2 500

              110

           2 750

250

10%

16-Nov-20

                 60

           1 500

                 45

           1 125

-375

-25%

17-Nov-20

                 64

           1 600

                 95

           2 375

775

48%

18-Nov-20

                 68

           1 700

                 72

           1 800

100

6%

19-Nov-20

                 64

           1 600

                 70

           1 750

150

9%

20-Nov-20

                 64

           1 600

                 78

           1 950

350

22%

25-Nov-20

                 46

           1 150

                 53

           1 325

175

15%

26-Nov-20

                 64

           1 600

                 70

           1 750

150

9%

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Updated table:

 

Date

Laps counted manually

Distance calculated manually

Laps counted on sense

Distance recorded on SENSE

Difference

Coefficient of variation

05-Nov-20

                 62

           1 550

                 68

           1 700

150

10%

06-Nov-20

                 60

           1 550

                 73

           1 825

275

18%

09-Nov-20

                 60

           1 500

                 76

           1 900

400

27%

12-Nov-20

                 64

           1 600

                 68

           1 700

100

6%

13-Nov-20

                 82

           2 050

                 86

           2 150

100

5%

14-Nov-20

              100

           2 500

              110

           2 750

250

10%

16-Nov-20

                 60

           1 500

                 45

           1 125

-375

-25%

17-Nov-20

                 64

           1 600

                 95

           2 375

775

48%

18-Nov-20

                 68

           1 700

                 72

           1 800

100

6%

19-Nov-20

                 64

           1 600

                 70

           1 750

150

9%

20-Nov-20

                 64

           1 600

                 78

           1 950

350

22%

25-Nov-20

                 46

           1 150

                 53

           1 325

175

15%

26-Nov-20

                 64

           1 600

                 70

           1 750

150

9%

27-Nov-20

                 64

           1 600

                 74

           1 850

250

16%

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See update below:

Date

Laps counted manually

Distance calculated manually

Laps counted on sense

Distance recorded on SENSE

Difference

Coefficient of variation

30-Oct-20

 

Not counted

 

           2 300

  

31-Oct-20

 

Not counted

 

           1 850

  

03-Nov-20

 

Not counted

 

           2 100

  

05-Nov-20

                 62

           1 550

                 68

           1 700

150

10%

06-Nov-20

                 60

           1 550

                 73

           1 825

275

18%

09-Nov-20

                 60

           1 500

                 76

           1 900

400

27%

12-Nov-20

                 64

           1 600

                 68

           1 700

100

6%

13-Nov-20

                 82

           2 050

                 86

           2 150

100

5%

14-Nov-20

              100

           2 500

              110

           2 750

250

10%

16-Nov-20

                 60

           1 500

                 45

           1 125

-375

-25%

17-Nov-20

                 64

           1 600

                 95

           2 375

775

48%

18-Nov-20

                 68

           1 700

                 72

           1 800

100

6%

19-Nov-20

                 64

           1 600

                 70

           1 750

150

9%

20-Nov-20

                 64

           1 600

                 78

           1 950

350

22%

25-Nov-20

                 46

           1 150

                 53

           1 325

175

15%

26-Nov-20

                 64

           1 600

                 70

           1 750

150

9%

27-Nov-20

                 64

           1 600

                 74

           1 850

250

16%

03-Dec-20

                 80

           2 000

                 82

           2 050

50

3%

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