We've had so much rain that all I've done when it has stopped is bail out the boat.
On another note, getting back to this topic, I have a question about the power pulg for the Garmin. On the plug there are two wires for voice (+&-). Can these wires be attached to a 3.5 mm plug and then be connected to the Aux plug on the HK radio to get voice directions? & if so, will it come on over the radio or just if the radio is tuned to aux? Or am I better off just using the cigarette plug with the speaker already built in? Decisions, decisions...
I would not use the power plug with combined speakers. It's not an outdoor part. The 27xx and 28xx series Streetpilots have an unamplified audio output plug that can be taken directly to the aux in on the radio. The 26xx series Streetpilot's aux out port was an amplified output that could not go directly to the radio. Needed a few bits in between.
If I remember correctly the Zumo has it's aux out port built in to the supplied motorcycle mount. Though for some (dumb) reason I'm pretty sure I remember that being a mono output.
Anything plugged in to the aux in port on the radio will only be heard if the radio is in aux mode. As far as the radio is concerned it's just another option no different than CD, FM or WB. And it only handles one at a time.