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 Precision 406 has been activated.

The Precision 406 can be activated manually by sliding the door to the left (breaking

the seal) and then momentarily pressing the ON button.

When activated the Precision 406 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 Precision 406 and also tests the EPIRB.

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

Precision 406 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 Precision 406 should be taken to a service agent.

5.3 Sea switch

It is important to realise that the only time the Precision 406 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 Precision 406 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 Precision 406 manually with the READY and ON

switches, the sea switch overrides any manual settings. For the manual switches to

operate properly the Precision 406 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