Region: South Jersey
Year : 91 Posts: 121
Keith, it sounds like you have your answer, but here's my take just in case. Both solutions that come to mind involve the end user making changes on his/her end. I don't think you can correct the data, just how it's processed in your analysis session.
Option 1: Once the data is graphed you can edit the channel. This is the same dialog screen where you can change the graphing range. If I recall, you can get to it by pressing the "..." button next to the channel on the measures toolbar. There's a y=mx+b function where you can adjust the graph. Just change the "m" to whatever multiplier you need. This is the easiest/fastest method, but you have to do it for every one.
Option 2: write a math channel that corrects the speed. I believe you can export/import math channels, but it's problably easier to have end user recreate it. This option would take longer, but it would only have to be performed once (and would be there in case you lost a magnet in the future).
By the way, adjusting the "b" function in option 1 is a good way to zero a steering sensor after the data is logged.