(3) Electronic devices that provide timing, heading, and heading memory but which do not transmit or receive data.

(emphasis mine)

I'm dissatisfied with the outcome due to the paucity of options that don't incorporate modern (1980s) technology. I mean to say that I was happy the Puck came out for a reasonable price, since the TacTic is such a poor, yet expensive, option. I get what the rule is intended to avoid. Doesn't change the limited real-world options for affordable, reliable, durable heading devices.