Check the listing for details. ALPHATRON ALPHACOURSE G MKR 051 REPEATER FOR GYRO COMPASS. Condition: Used. Listed at 1254.57 USD. Enhance your boating experience with the ALPHATRON ALPHACOURSE G MKR 051 REPEATER FOR GYRO COMPASS. This top-of-the-line compass is designed to provide you with accurate and reliable navigation. It is manufactured in Japan by ALPHATRON, a trusted brand in the electronics and navigation industry. This compass is ideal for boat owners who want to improve their navigation skills. It comes with a range of features, including a gyro compass, which allows you to easily navigate in any direction. Additionally, it has a repeaters for GYRO COMPASS, making it an excellent choice for those who want to enhance their boating experience. With this compass, you can be sure that you will always know where you are, no matter what your weather conditions may be.