Mike Copeland of SECO gives a very good explanation in the video from the link above

Thanks Robert,but noHere are a few more part numbers for the TrimTalk 900 Series23800-81 TrimTalk 900 Base Equipment Set23800-00 TrimTalk 900 Radio Mo...

Thanks Robert,but noDane,Would any of these numbers help?TRIMTALK 900 Equipment SetsThe TRIMTALK 900 radio modem provides a versatile means of establi...

Would a TRIMTALK 450 Manual help?TrimTalk 450 Manual[/url]][url/a>

You may have more problems with Vertical Angle Accuracy than Distance Accuracy to non-tilting prisms on steep sights. Take a look at the Eclipse Noda...