Garmin Tr1 Manual

31
Navigation Function Codes 
            Setup Action  Code #         Range of settings or Responses  Default 
Navigation Gain 15  1 lowest gain, 73 highest gain  42 
Navigation Trim Gain 16  1 lowest gain, 73 highest gain  49 
Use Synthetic XTE  37  2 settings on, off  off 
Change Sign of XTE 18  2 settings  on, off  off 
Use Magnetic North 39  2 settings on, off  on 
Set North 48  Hold Down Select Load Button, press and 
release Deckmount Button to set north  
See Notes code #48 
Enable Checksums 347...

Code 35. 
Since the boat dynamics change with RPM the autopilot retunes itself as it sees the RPM change. 
Most boats will work well with the mild setting.  The easiest way to set the speed schedule is to 
first get tuned up and working well at low speed, then run at high speed.  1) If steering response 
is sluggish, increase code 35.  2) If the steering response is oscillatory, decrease code 35. 
Code 37. 
Turning this parameter on may provide tighter course line tracking when you are within one mile...

33
     
Your autopilot needs to be “tuned” to your boat and motor configuration.  This is the most difficult part of 
getting your pilot running the best it can.  Have patience and don’t even try to do this until you have some time 
on a nice calm day.  Follow the directions below.
1.    Calibrate your compass.  The autopilot compass is made with a fluxgate.  Like all compass installations, 
fluxgate installations are susceptible to local magnetic disturbances that will cause erroneous heading outputs....

34
3.   Tune the feedback gains.  Start from [Standby] mode.  (The STBY light should be lit on the handheld.)
    • Press the [
Setup] button and press and light up code 2 (Number 2 LED on the handheld) - \
this    
       is the rudder gain adjustment code.  Run your boat in a straight line\
 at 1/3 to 1/2 full speed and   
     engage the pilot by pressing the 
Auto/Stby button.  Don’t expect to see good performance yet. 
 
a)  If the boat heading and kicker start oscillating, turn the Rudder G\
ain...

35
4. Set North:  You must do this, if the autopilot is connected to the GPS.
To run a GPS course requires that the autopilot compass is in agreement with the GPS’s course estimate.  You need to set 
North with the pilot in standby mode.  Do not set North except in calm sea’s and un-accelerated conditions.  You should 
be running at a reasonably high speed, it won’t hurt to be running on plane with your main engine.  With your GPS turned 
on and setup code 48 selected, press and hold the GPS (Select...

0
2
4
6
8
Heading
0246810
Time
Well Tuned Response
     The objective of tuning is to set the gains so as to elicit a response with a shape like this that 
reaches the 5 degree heading in as short of a time interval as possible.  You know that you have 
reached this tune when attempts to increase the Rudder Gain or Decrease the counter rudder gain 
results in oscillations in heading. 
     Initial factory setting for Counter Rudder Gain is on the high side for most boats and the 
initial factory setting...

0
2
4
6
8
Heading
0246810
Time
Too Low
Too High
Rudder Gain Effects
The Rudder Gain Effects plot shows that too low a Rudder Gain will make the heading response 
slow and sloppy, if the Rudder Gain is turned down much lower the heading response will 
become unstable (do everything but hold heading).  The plot also shows, when the Rudder Gain 
is set too high, that the heading oscillates with a high frequency, the rudder will be seen to be 
oscillating with large amplitude and high frequency as the...

Limited Warranty
 
This TR-1 product is warranted to be free from defects in materials or w\
orkmanship for one year from the 
date of purchase.  Within this period, TR-1 will, at its sole option, repair or replace any components that fail in 
normal use.  Such repairs or replacement will be made at no charge to th\
e customer for parts or labor, provided 
that the customer shall be responsible for any transportation cost.  Thi\
s warranty does not cover failures due to 
abuse, misuse, accident, or...