I think you are messing up on turning the TDC on. I click it on when I take the first observation and LEAVE it on. If it isn't already on when the last range/bearing every second till you do push it induces errors. The only time I don't is when I plan on making a as it crosses the wire shot. Then I never turn it on at all. I can think of no reason not to power it on from the start.
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