User's Manual

CONTROLS

5.1 ON button

This is hidden behind a sliding door, which protects it from accidental activation. The

sliding door has a tamper seal to show if the G4 has been activated.

The G4 can be activated manually by sliding the door to the left (breaking the seal) and

then momentarily pressing the ON button.

When activated the G4 will start to flash immediately. It will not make any distress

transmissions for 3 minutes. This gives you a chance to turn it off if you activated it

accidentally. During this 3 minutes the red lamp illuminates continuously. When the

red lamp starts to flash, the 3 minutes delay has passed and distress transmissions

have started. Normally the green GPS lamp will start flashing within the first 5 minutes.

5.2 READY button

This button de-activates the G4 and also tests the G4.

Ready Pressing and releasing this button quickly will de-activate the G4 and

return it to its “ready” state. When the button is released the strobe

and the red & green lamps will stop flashing.

Self-test Pressing and holding the ready button (for about 10 seconds) will

allow the built-in self-test to run. When the button is held down the

red lamp will come on for 4 seconds, then go off. During this time

both the 121.5MHz homer and the 406MHz satellite transmitter make

“safe” transmissions. If both of these test transmissions arrive at the

antenna with sufficient power then the strobe light will flash 3 times

to tell you that all is well. If the red lamp does not come on, or the

strobe light does not flash within 10 seconds, then there is a fault;

the G4 should be taken to a service agent.

5.3 Sea switch

It is important to realise that the only time the G4 is completely off is when it is fitted in

its mounting bracket or enclosure. As soon as you take it out, a magnetic switch

activates and puts the G4 into its “ready” state. It will not drain the battery in this state,

but it will turn on automatically if the sea switch contacts are bridged by water. The sea

contacts are the two exposed screw heads beside the rear switches.

Although you can control the G4 manually with the READY and ON switches, the sea

switch overrides any manual settings. For the manual switches to operate properly the

G4 must first be dry so that the sea switch is de-activated.

To ensure the sea switch operates properly in rough seas, it has a built-in time delay. It

has to be wet for at least 2 seconds before it will activate and it has to be dry for at

least 8 seconds before it will de-activate.

READY

HOLD TO

TEST