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Gain Calculation Error in 705?

Former Member
Former Member
It's raining today so I did a calorie test using my truck, no HR of course, and the 705 calc'd calories with just speed and distance and gain. I recorded one ride driving up a long steady hill and then a second separate ride back down. Managed to start and stop at almost the same spots getting the same distance and kept the same average speed both ways.

I was very impressed with the results. Uphill 585 calories. Downhill 8 calories. Obviously the gain is a major factor in the calc's because that was the only piece of data that changed. Here are the files. You can open them in TC and see for yourself.

There was one major error. The total gain calculated by the 705 was 145ft on both directions whereas the actual elevation difference shown on both profiles was 240ft and Google Earth shows 240ft of elevation difference also. That is a huge software error. The recorded trackpoints and profile agree with each other and Google but the 705 software calculated the wrong total gain for both rides.

Is this a software bug?
  • Former Member
    0 Former Member over 15 years ago
    I've actually talked to support about the elevation readings, and basically they told me that because of the technology in general it's really hard to get accurate readings.

    What happened to me was that I started from my house, ran a big loop, and then looked at elevation data. Apparently my house had "sunk" about 50 feet or so compared to when I left. So I think this data has a pretty large margin of error...
  • Former Member
    0 Former Member over 15 years ago
    Yes, my 705 gets that same error of a different end elevation at the same spot where I started.

    But the 2 tracks I attached in post #1 have a different error and equally wrong on both tracks.

    The 705 correctly recorded 240ft of gain on both tracks and TC correctly plots both profiles showing 240ft of gain but the software calculates only 147ft of gain on both tracks.

    The 705 is recording data correctly but the internal software is not reporting it correctly.

    Tech support are you reading this? Can you load the files and see what is happening? Thanks for any help,