Lok8u num8 - Manual (Page 24)

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Now select the update rate and give the Safe Zone a name
Click “Set now” or “Save to list” as in multi-point earlier.
The reason you may wish to select multipoint rather than radius is, as can be seen above, the
circle includes a main road as well as the park, a multipoint allows you to eliminate these risky
areas from the Safe Zone, similarly a pond in a park could be removed from the Safe Zone.