Manual says if calibration is required It will display "C" after zone selection but it sounds like that isn't happening. If the blend mount is metal that may be the issue, any way to move the mount further away from mirror?

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The Blendmount is aluminum so I wouldn't think it would affect the compass. It does have a half-dozen steel 4-40 screws holding it together, but I'm guessing the detector might be the bigger source of distortion. I'll pull the detector tonight when I get home to see what happens. Will also grab my orienteering compass from my backpack and see if it picks up any distortions around the detector. Thanks for the quick response!

 

Go to the hardware store and get stainless (still magnetic some) or brass 4-40 screws.

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Go to the hardware store and get stainless (still magnetic some) or brass 4-40 screws.

Have tons of stainless 4-40's in my lab. That's an easy tweak.

 

Ok, problem turned out to be something more subtle. It was the magnet that's inside the radar detector! Escort put a strong magnet inside the detector's case to help keep the detector and their sticky-cup mount mated. As I was getting ready to replace the screws with stainless ones, my steel Chapman Tool snapped against the detector and I knew immediately what the problem was. When I slid the detector out of the mount, the compass error got worse, and when I moved it away from the mirror and closer to the windshield, the compass began reading correctly. Now I have to pop the cover on the detector and remove the magnet.

 

Good find!!! Sounds like easy fix.

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So what effect did this magnet have on the other two compasses in the car?

 

Wasn't aware of there being other compasses in the car or where they might be located. I would guess there is one in the pod on the roof where the satellite and GPS antennae are located, but the other, no idea. In any event, if they're beyond a sphere roughly 1' in diameter and centered on the detector, they shouldn't be affected. Since the detector is essentially suspended in space right below and slightly in front of the mirror, the mirror should be the only thing affected.

 

Compass was waiting for McCafe. LOL

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Apparently! Hey I'm big enough to admit I like the golden arches on occasion!

 

Ahhh...been dealing with fiber optics too long. MFD to me means mode field diameter.

Anyway, I haven't seen any unusual behavior during my drive this morning. Compass responded in a timely fashion with every turn I made and nothing else seemed wonky. Got the Thinkware wired in yesterday so now I guess it's time to enjoy the fruits of my labor! Thanks all!