Changed diplay_mode to range_units (more descriptive)
Added watchdog for position data flow
Added alarm zone machinery
Modified distance calculations to add "local distance" (line of sight) and "local bearing"

Signed-off-by: cowelld <david.cowell@ymail.com>
Added interaction with Alarm Panel

Signed-off-by: cowelld <david.cowell@ymail.com>
Changed Heading correction to text entry.

Signed-off-by: cowelld <david.cowell@ymail.com>
Signed-off-by: cowelld <david.cowell@ymail.com>