On Sunday, January 12, 2020 at 8:27:19 AM UTC-8, Dan Marotta wrote:
...or just look at the section lines on then ground.Â* If the sun is
shining, it's pretty easy to guess the cardinal directions.

On 1/11/2020 8:58 PM, Eric Greenwell wrote:
Charles Longley wrote on 1/11/2020 6:59 PM:
Pfft compass what’s that? Look out the canopy.

Not a good option in Kansas! You are spoiled by flying where there are
mountains to guide you. In Kansas, look at the GPS track when you want
to know direction. Or pull out your iPhone, and use the compass app.


--
Dan, 5J

Garmin's only precaution about the placement of multiple GPS antennas is the potential effect of one antenna shadowing another:

3c. To minimize the effects of shadowing at 5° elevation angles, the GPS antenna should be mounted no
closer than 6 inches (edge to edge) from other antennas, including passive antennas such as another
GPS antenna or XM antenna.

http://static.garmin.com/pumac/GA35G...structions.pdf

And if you want to share a single antenna with multiple instruments you can get a splitter (albeit not cheaply!):

https://www.gpssource.com/collections/gps-splitter

Tom