Looking for a good GPS


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wally
Posts: 350
Joined: Fri Jun 11, 2010 7:55 am
Location: Yale, Michigan
Motorcycle: 1982 GL1100A Aspencade

Looking for a good GPS

Postby wally » Sun Dec 19, 2010 7:51 pm



I'm hoping to get a GPS unit to mount on my bike, but with all the brands (Garmin, Tom Tom, Magellen) and then the many different models, who has compared the features and knows a good GPS unit to get. I'd like one with a fairly good size screen but not too pricey! Also does anyone know if you can wire in a jack into the AM/FM radio on my 82 wing to play an Ipod or even the GPS through the radio's amplier, and instructions of how to do it?



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dingdong
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Motorcycle: 1976 gl1000
1993 gl1500
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Re: Looking for a good GPS

Postby dingdong » Mon Dec 20, 2010 9:13 am

I don't have an answer as I am researching GPS also. Look here for comparisons and ratings.

http://www.pcmag.com/category2/0,2806,2937,00.asp
Tom

A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.

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WingAdmin
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Re: Looking for a good GPS

Postby WingAdmin » Mon Dec 20, 2010 10:15 am

I have a TomTom One on my bike, and have had for quite some time. I picked it because it's cheap, reliable and easily replaced if it gets damaged. That said, I've ridden through hours of rain with it, and it's worked perfectly despite not being waterproof.

It did not have a headphone jack in it, so I installed one. To install the jack on the TomTom, I first drilled three holes on the exterior of the TomTom case, for the jack's pins. I then epoxied the jack to the outside of the case, with the pins pushed through the holes:





Then I cut the speaker wires and wired them into the jack so that the speaker works normally when nothing is plugged into the jack, but once something is plugged into the jack, the speaker is bypassed:



I wanted to wire the speaker output of the GPS into the microphone circuit of the intercom, so the GPS would talk over the intercom and mute the music, just as if the driver or passenger was talking.

My original plan was to use a telephone transformer as an isolation transformer, and to add a resistor to bring the level down to avoid overloading the microphone input of the wing's intercom. The microphone input is expecting the tiniest amount of voltage coming from the microphone, and the output from the speaker of the TomTom is more like 1-2 volts.

However, putting a transformer in the anywhere near the ignition coils (i.e. exactly the kind of place you'd mount the GPS), the coil in the transformer will pick up all the ignition noise. So, being that I needed to reduce the output considerably anyway, I thought I would just try using a resistor instead.

I connected the ground of the TomTom's output to the ground of the microphone input on the bike - which resulted in horrendous noise. Obviously there is some sort of connection between the two when the TomTom is being powered by the bike.

Knowing that there was a connection between the two already, I disconnected the ground entirely and wired the speaker output of the TomTom into the input of the microphone circuit on the bike, through a resistor. I made an educated WAG (wild ass guess) and used a 15K resistor. It turned out to be the perfect value.

So connecting the output of the TomTom, through a 15K resistor, into the input of the mic circuit of the intercom, and leaving the ground open, sends the audio from the TomTom directly into the intercom at exactly the right level. There is no ignition noise present, and only very slight digital hash noise present from the TomTom (inaudible once the bike is moving).

I would be very surprised if this doesn't work for other GPS units as well.

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maestro319
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Motorcycle: 1986 Honda Goldwing 1200 Aspencade

Re: Looking for a good GPS

Postby maestro319 » Mon Dec 20, 2010 12:54 pm

Sheesh...how'd you get to be so smart and clever??

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WingAdmin
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1998 XV250 Virago (sold)
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Re: Looking for a good GPS

Postby WingAdmin » Mon Dec 20, 2010 7:58 pm

Years of learning from my mistakes. :)

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wally
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Location: Yale, Michigan
Motorcycle: 1982 GL1100A Aspencade

Re: Looking for a good GPS

Postby wally » Mon Dec 20, 2010 9:44 pm

Wow! The info and pictures are great! Just a tad foggy on wiring in the resistor, could you add one more picture of that wiring? Thanks for a great response. :)

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WingAdmin
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Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: Looking for a good GPS

Postby WingAdmin » Tue Dec 21, 2010 4:03 pm

I don't have a picture of the resistor wiring - but what I did was cut into the wire leading from the headset plugs to the component terminal inside the fairing. I spliced into the microphone wire, and ran a shielded wire, in series with the resistor, to the "tip" portion of the GPS output jack. No ground at all - just the tip.

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wally
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Location: Yale, Michigan
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Re: Looking for a good GPS

Postby wally » Tue Dec 21, 2010 8:23 pm

Ok, thanks! This is another project I can add to my to-do list. Merry Christmas! :)

dubonnet
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Location: Casa Grande AZ
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07 GL 1800

Re: Looking for a good GPS

Postby dubonnet » Sat Dec 01, 2012 3:59 pm

To make the great idea in this post even simpler just use 103 capacitors between speaker and jack. Speaker then works as normal and the level of the input to the intercom circuit can be adjusted with the volume control control on the GPS. No need for resistors or extra wiring.

dubonnet
Posts: 9
Joined: Sun Feb 26, 2012 10:10 am
Location: Casa Grande AZ
Motorcycle: 96 GL1500 SE
07 GL 1800

Re: Looking for a good GPS

Postby dubonnet » Sat Dec 01, 2012 4:03 pm

I forgot to mention the capacitors act as a ground loop isolator therefore no hum, alternator wine .

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wingit11
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Location: Lethbridge, Alberta, Canada
Motorcycle: 1983 GL1100A Aspencade
1990 GL1500SE/California Sidecar Friendship III

Re: Looking for a good GPS

Postby wingit11 » Sun Dec 02, 2012 12:17 pm

I found a GPS (Garmin Nuvi 755T) with an FM transmitter in it. I just tune to a FM frequency and the prompts go through the stereo. Downside is you can't listen to music on the stereo if you want directions from the GPS. It's either one or the other on my '83 Aspencade. On my 1500 I installed an intercom interface and just plug it into the output jack.




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