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Author Topic:   Locating Electronic Instruments On Helm Console
gbcbu posted 06-06-2007 02:32 PM ET (US)   Profile for gbcbu   Send Email to gbcbu  
I just received my GPSMAP 440 from Garmin. I'll install it on my 170 Montauk. On top of the center console there is a factory installed Navman Fish finder. I'm trying to avoid moving the Navman an inch or so to the right on top of the console because I need that much room to place it between the anchor light socket and the Navman. Of course if I have to I will. The only other possibility is to place it directly in front of the helm near/beside the compass. When I placed it near the compass it interfered with the compass reading which I'm not concerned about. However, will the compass interfere with the GPS if I position it beside the compass. Any recommendations for finding someone to install this ( Quincy, Ma area) because I think that's what I'll end up doing anyway but I'd like to give it a go.
bluewaterpirate posted 06-06-2007 02:48 PM ET (US)     Profile for bluewaterpirate  Send Email to bluewaterpirate     
The door that hides the SD Card reader has a magnet attached to it. You can remove that magnet with a small flat head screw driver... it pops right out. In the magnets place install a small piece of valcro both on the door and the 440 itself. This will keep your door closed and secure. Your problem of magnetic interferance then become a thing of the past.


gbcbu posted 06-06-2007 02:52 PM ET (US)     Profile for gbcbu  Send Email to gbcbu     
Thanks Tom. If I have to I can always remove the GPS to use the compass. But will the compass interfer at all [with] the GPS? Also, I downloaded the new updates to an SD card and once installed I'll get that in. Thanks
bluewaterpirate posted 06-06-2007 03:00 PM ET (US)     Profile for bluewaterpirate  Send Email to bluewaterpirate     
No [a magnetic compass will not interfere with] the reception [of a GPS receiver].
pglein posted 06-06-2007 04:20 PM ET (US)     Profile for pglein  Send Email to pglein     
No, the compass will not interfere with the GPS. The compass is a passive mechanical navigation device. It does not transmit any signal or electronic field aside from I suppose a trace amount from the light bulb's wiring (if equiped). The GPS is a modern piece of electronics that should be shielded against all forms of electronic interference. It's behavior should not be affected in all but most extreme of situations (eg: suspending it immediately adjacent to a high-tension electrical transmission line).
gbcbu posted 06-06-2007 07:24 PM ET (US)     Profile for gbcbu  Send Email to gbcbu     
Thank you all, felt that the compass would not interfere but needed to make sure. This , at least gives me another option for positioning it.
gbcbu posted 06-07-2007 07:22 AM ET (US)     Profile for gbcbu  Send Email to gbcbu     
I've just reviewed the manual for the Garmin 440 and the section re: "Select a location" does not mention anything about interference from a railing. If I place the unit under the railing at the top of the CC I'll have plenty of room to position it between the anchor light socket and the exisitng Navman. It will look like the set up of GreatBayNH (see pictures at post on cushion mat in rep/mods). The unit has it's own internal antenna and if it's 1/2 as good as my car's magellan ( which works inside the car) the railing should not be a problem. Any thoughts?
davej14 posted 06-07-2007 01:05 PM ET (US)     Profile for davej14  Send Email to davej14     
Before picking the final location you should be able to view the satellite signal strength by holding it in various locations. Most GPS units have a viewing mode for this. Be sure to hold it from the bottom because if your hands are between the antenna and the satellite they will attenuate the signal.

This is the only way to determine the optimum location for a specific GPS unit and boat combination.

gbcbu posted 06-07-2007 01:33 PM ET (US)     Profile for gbcbu  Send Email to gbcbu     
Thank you and will do. I intend to plug the unit in the acessory/cigarett lighter socket before drilling or connecting the unit.

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