I am still experimenting with TDC procedure and havent found one yet that I really like. My main objection is the inability to manually set the range. If there is a way to do it, I would apprecitat it if someone could let me know. For example, in the rare case where you actually have time to track a target for a while, if the tdc plot is not tracking properly and you know your solution needs adjustment, you can manually adjust the aob and speed estimates, but there is no way to make an adjustment for the range, because as far as I can tell, the only way to enter range is by the split image method, and if your boat is bouncing and you get a result you know is not correct, you are stuck with it until you get a chance to do it over, which means exposing the scope more than you want to. Joe S
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