You've got it all quite right.
So you have the freighter on beam 10. You look at 1 beam display, beam 10. Now you turn. With no 'slave to tag' the freighter will move to beam 11 and you will not see it anymore. With 'slave to tag' the display will switch to tag 11 so you can keep an eye on the 'slaved' tag even when turning.
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