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McMurdo G4:
McMurdo G4. Also sold in yellow as Pains-Wessex SOS Precision, and with green labels as Sailor GPS 406. To test, press and hold in the TEST button for 10 seconds. Strobe light should flash 3 times. Expiry date is at the base of the antenna, at the back. Serial number is read through a window in the gasket, just in front of the strobe tube.
