>>994657Wild. My compass is on the keychain I keep my truck keys and spark plug gap gauge on... Neither are particularly magnetic, but i'm sure it could throw off the compass a bit. The keychain's a short length of paracord, so those metal bits are far enough away to not interfere.
My old-old-old GPS12 freaked out every now and then on my old-old sled, interference from the spark plugs or dash instruments would cause the receiver to calculate wildly inaccurate positions, and eventually just give up and say "GPS Unuseable" or something to that effect. I'd have to shut it off and restart it for it to do anything again.
Cracked the case open, and there was no shielding behind the patch antenna or on the RF section of the PCBA.
Cut some tin and soldered it over the back of the antenna and PCBA to shield it, GPS worked fine after that.... never had any more problems.
I only ran that GPS12 for a year or two before I picked up my first 60CSx. That 60 didn't have any problems with the same sled, and I haven't had any issues with any of my other GPS's with any of my snowmobiles/motorcycles since then.
