An altitude-activated tracker would do the trick. When the BIB goes higher than it's tether would allow, as would happen in a break-away, the tracker gets activated. Worth the weight.
nilremerlin
New long-term bull market from Oct. 16, 2008 (+6 months for underbubble overreaction) to Feb. 5, 2018 (+6 months for overbubble overreaction).