Brand Ritchie
Manufacturer Part Number MS-080

Check the listing for details. Ritchie Magtronic Compass Sensor MS-080 (serial data, 12V supply). Condition: Used. Listed at 160.00 USD. It puts out one sentence per second with heading, making it easy to use as a hello world feed. (One of my favorites was writing a compass display in Squeak for the console of a boat project, displaying indexed photographs of a real compass corresponding to the data from this).

$80.00
$160.00