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Go Back   SailNet Community > On Board > Gear & Maintenance > interfacing GPS to Autohelm
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Topic Review (Newest First)
10-28-2003 11:31 AM
mcain
interfacing GPS to Autohelm

I have interfaced a Garmin 162 to a Raymarine (Autohelm) 4000. Personally I love it. (Of course, I am a gadget freek).
The way it works is that you first activate a route on the Garmin. Then on the 4000, you first hit "auto" to engage the autopilot, flip the lever to engage the pilot motor drive, then "track" on the 4000 to get it to recognize the signals from the Garmin. Then the 4000 will beep and ask to turn to the new waypoint and you hit "track" again to confirm the turn. Each time you hit a new waypoint, it will beep and ask you to hit "track" again to confirm the turn. And yes, the reason per previous poster, is for you to visually confirm that it is safe. In the meantime, the 4000 is steering by XTE as well as heading, so I found the steering to be more precise, particularly in a seaway. Also great for staying in channels or away from shallow water. Much better control than just steering to a heading. In a seaway, I have found less wandering when using the track function.

The interface itself is via NMEA--be sure to set the Garmin I/O to NMEA in and out, not Garmin protocol. The wires go from the Garmin to NMEA input of the 4000.
I do NOT connect Seatalk to the 4000--if you want the 4000 to steer to wind direction, then you need a Raymarine wind instrument and Seatalk. I havn''t tried to have the 4000 steer to wind from a NMEA device, though it might be possible.
The NMEA interface is 3 wires, of which only 2 are required.
From memory, I believe the 4000 is labeled + and -, while the Garmin is +, - and gnd or common.
The last time I did this, I first made an error in connecting the GPS - to 4000 -, so check the wire connections. You can see if it worked by hitting the display button on the 4000 and seeing if the XTE display matches the Garmin XTE. Also check the baud rate--it is selectable on the Garmin--I believe it should be 4800 but don''t quote me.

I recently replaced the Garmin with a Raymarine 530 and still used NMEA to connect, rather than seatalk. I have found that Seatalk is problematic--if there is a power surge anywhere in the system, it can kill seatalk on one of the connected instruments, then all crap out. The 4000 is then dead completely, waiting for seatalk to be restored, and even the simple "pilot to a compass heading" won''t work. To restore the simple function, you have to unplug the offending seatalk connection from the 4000--easy to say, but hard to do in a seaway with the 4000 mounted in a navpod.
I had the navpod apart this last weekend, doing some other wiring, so if you are still at a loss, let me know, and I can check out the wire colors. While I have replaced the 162 with the 530, I still have the 162 at the helm, ready to plug one wire into the 4000 if needed.

10-23-2003 12:03 PM
obiec
interfacing GPS to Autohelm

well yes I am aware of that, It makes good sence, However most peaple think you can put in a rout and be done with it. and It is not so. and changing your heading to a new one is only around 4 or 5 presses of a button it is real easy. acepting a new heading from your auto pilot is one button, so you save mabe 3 seconts time . big deal.
10-23-2003 04:07 AM
gershel
interfacing GPS to Autohelm

The reason you have to tell the autopilot that it''s OK to turn is so that you can make sure you are not going to run into anything, like another boat.Doesn''t that make sense?
Marc
10-22-2003 09:00 PM
obiec
interfacing GPS to Autohelm

I tride doing that 2 years ago with a 3000 raymarine and a 176 Garman. It did not work ether. I called raymarine and thay said you neaded a see talk box. How ever when ever you come to a change of corse you will have to tell your auto pilot that it is OK to turn, It is almost as easy to just punch in the new heading. The only real advantage is for curent or windig, The cross track will help keeping you on course for your next way point.
10-22-2003 01:13 PM
chuck711
interfacing GPS to Autohelm

Need insight interfacing Garmin 176C to Raymarine Autohelm 4000.
Will the Autohelm track by the route in the GPS?
How do you interface and get it to run a route?
Tried using the NEMA connections.

 
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