My absolute first reaction would be the chime module!! It does have a constant battery draw and I would think that to blame before the Nav. I have never had a radio draw enough current to affect a battery. Interface modules, on the other hand, have been a constant source of problems for us even the good ones.
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\'05 Slate Blue Sut w/ Magnusun, JBA headers, custom exhaust, 22\" MC2 RT5 wheels, Pioneer AVIC Z1 nav, Passport SRX, Vizualogic A1000 dual, bi xenons, fog xenons, dual optimas, and just gettin\' started!
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