Garmin TR-1 - Manual (Page 6)

6
Security Codes
Each keypad transmitter transmits its own unique identification
code when a button is pressed. The receiver computer must
be programmed to recognize your transmitter. Program the
receiver/transmitter pair by:
1) Turn the TR-1 Autopilot on.
2) Watch the LED on the receiver box, when it starts blinking-
press any button on the wireless keypad until the LED stops
blinking.
You will need to do this (once) anytime you change keypads.
Replacement Remote Keypads
You may purchase replacements by calling Nautamatic Marine
Systems, Inc.
1-800-588-7655
Inside the back cover of your keypad is written a 3 Character
code. This code is the security code that your receiver has been
trained to respond to. If you would like to keep this code, tell
the sales representative at the factory the code digits when you
order your new keypad. If you do not care about the code,
you will be sent a keypad with a randomly assigned code. You
can, of course, reprogram your receiver to recognize the new
keypad when you take it to your boat.