Mounting Garmin eTrex GPS in payload bay?

Wrap it in rags or paper towels instead of bubble wrap. Same padding effect, wont stop air.

I have the Vista also, and I wrapped mine in bubble-wrap lengthwise, leaving the ends hanging out but not folded over and sealed. Worked fine.

The Garmin GPS units that include a pressure sensor are of two minds when it comes to reporting altitude. The value displayed and recorded in internal track logs is based completely on the pressure sensor. The unit magically calibrates this pressure sensor using the GPS solution but it doesn't use the GPS solution in the altitude reported. Or at least that is my conclusion after flying a Garmin Summit three times.

If you want the actual GPS altitude, it appears that the serial NMEA data reports this.

I mounted the GPS by gluing down some foam (typically used to cushion R/C electronics) and then holding the altimeter in place with zip ties.

Will Marchant wrote: > Several people have wrapped their Garmin eTrex GPS unit in bubble wrap > and shoved it into the payload bay. I've got a Vista >

That is exactly the behavior I've observed with my Summit. I've seen sudden variations while driving from cracking open a window, or closing one. And it's really wacky while flying on commercial airlines. Forcing altimter recalibration gives a correct GPS altitude for a few moments, then reverts to the wacked baro altitude.

The annoying thing is that to get the magnetic compass SiteNGo feature, you get the #!%@ baro and there is NO WAY to turn off the baro. You can turn off the compass...

Bob Kaplow NAR # 18L TRA # "Impeach the TRA BoD" >>> To reply, remove the TRABoD!

Does your GPS unit require the aiflow for cooling?

Alan

There are no cooling requirements for GPSFlight units, and i'm not aware of any for any GPS system.