[CA] [CA11] LH3 Anchor alarm

[danderer]

In thinking about this, would you mind submitting it as a feature request? It'd just be adding the ability to display the current distance to the already-known anchor point.

Since my initial request I've researched more and found other systems that support this and it is a nice feature. (And I reassured myself I wasn't imagining the feature, just that LH3 had it.)