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----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- I'm not an expert but I have these thoughts: Try parking your plane on the compass rose and note the compass heading with the power off. Then turn on the power to the plane and all avionics then gently tap the compass (to overcome any stiction) and see if it lines up differently. Then turn the power off and tap the compass again. Often, compasses react to the electrical field around poorly shielded electronics or wires that carry power. If this seems to be power related, try complaining to the avionics shop to which you paid the big bucks for installation - this would be a case of poor shielding. Turn on and off different components to determine which is the culprit - the installation might have made a previously well behaving avionics item start to put out a magnetic field. I guess I'd next try adjusting the compass with the brass (or plastic) screwdriver and see if I can adjust out all (or almost all) the error. I'd carefully note the deviation with power on and power off (if they're different) on my compass deviation card. If all else fails, I'd try re-routing the power leads to the new radio or relocating the compass to high on the windshield (if that's an option on your plane.) Good luck. Ed Burkhead http://edburkhead.com/ [EMAIL PROTECTED] -----Original Message----- From: john jameson [mailto:[EMAIL PROTECTED] Sent: Tuesday, December 31, 2002 4:06 PM To: [email protected] Subject: [COUPERS-TECH] glareshield compass hi. i have two 46 ercoupes but this tech question relates to my 69 aero commander 100 darter. i just installed a garmin 300xl gps com on the top of the radio stack and my compass just above it on the glareshield is now reading off about 20 degrees. shat should i do? should i mount an spacer that raises up the compass about a half inch? or try to mount it at the top of the windshield (don't see how i could do this). or buy a vertical card compass for 250 dollars and hope it isn't as sentitive to the magnetic interference? what do you fine ercouper's suggest? i can't afford to lower the expensively mounted gps/com in the stack. it works great. ========================== To leave this forum go to: http://ercoupers.com/lists.htm ========================== To leave this forum go to: http://ercoupers.com/lists.htm
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