Fred Christiane Brychta posted an answer for this Casio Digital Compass Twin Sensor Sport #SGW1001V Watch for Men:
"THe PRO-TREK watch compass is very sensitive to nearby Iron (eg. cars, fridges,..."
Fred Christiane Brychta posted an answer for this The Watches:
"I believe the RECO refers to the NIST time signal that the watch receives at about 2-3am..."