PM4 - Max monthly metres on Monthly Summary display?

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fbcc2
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PM4 - Max monthly metres on Monthly Summary display?

Post by fbcc2 » June 2nd, 2013, 2:03 am

Hi everyone,

Just wondering if there's a maximum figure the PM4 will display for distance rowed on the Monthly Summary display? My monthly totals as displayed on the PM4 are shown in the attachment - as you can see March, April and May all show 655,350 metres, is there a limitation in the PM4 that prevents a higher figure being displayed?
IMG_20130602_154611_613b.jpg
IMG_20130602_154611_613b.jpg (26.57 KiB) Viewed 6385 times
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OarConsequences
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Re: PM4 - Max monthly metres on Monthly Summary display?

Post by OarConsequences » June 2nd, 2013, 5:03 am

Would be surprised if that's the upper limit. That number just happens to be (2^16-1)*10. Or in other words allowing for 2 bytes of data to represent any mileage amount in the range of 0, 10, 20...655330, 655340, 655350.

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Citroen
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Re: PM4 - Max monthly metres on Monthly Summary display?

Post by Citroen » June 2nd, 2013, 5:40 am

The monthly total has always been rounded. Nobody has reported the artificial limit before, I guess because very few folk do a HM every day.

I assume the data for each workout is correct on your logcard.

fbcc2
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Re: PM4 - Max monthly metres on Monthly Summary display?

Post by fbcc2 » June 2nd, 2013, 8:39 am

Citroen wrote:The monthly total has always been rounded. Nobody has reported the artificial limit before, I guess because very few folk do a HM every day.

I assume the data for each workout is correct on your logcard.
All the invididual workout data is correct, and the monthly totals in the online logbook are correct, so it's just the monthly totals on the PM4 that seem to hit this upper limit.

I hadn't actually realised I average a HM every day - that's just how it averages out (typically it's a 16km session each weekday - with the odd 2 x 16km days, and two 16km sessions per day on the weekends / days off)

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Re: PM4 - Max monthly metres on Monthly Summary display?

Post by fbcc2 » June 4th, 2013, 9:35 pm

Hi everyone,

Just updating this is the reply I received from Concept2:
That is the upper limit.

16 bits are stored, this gives 65535, but we round/truncate the monthly totals to 10m (diminimus amount of error) so this gives us a range of 0-655350 meters in 10m increments; which is more than we expect 99% of users to accomplish in a month. This was a choice made in 2002/2003 when the logcard format was being determined.
So all's well with my PM4 :-)

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