Thanks for all the input, guys (and gals?). We decided to just mount it on the glareshield. It's so low profile you can hardly notice it, just wish it was brown like the carpet up there. For VFR only, the Feds don't need to sign off on it, and I just got back from picking it up at the shop. It acquires satellites immediately and provided perfect navigation on my short trip home. It's so nice to no longer be waiting interminably for the LORAN to lock up. BTW, the Apollo GX-65 GPS/COM that I bought on ebay was advertised (elsewhere, and by Garmin) as a slide in replacement for Apollo 604 LORANs. Not the case. Even the tray had to be switched to match up with the new wiring harness. Other than that I would highly recommend this unit, which is also available new from several internet sellers (avionix.com). You get a decent GPS with moving map and a new COM to boot, for around $3000, or much less if you can find one on ebay, etc.
Scott
N74445