Luke wrote:
On 08/09/2011 5:42 PM, Eric Greenwell wrote:
On 8/9/2011 1:01 PM, Luke wrote:
On 08/09/2011 12:58 AM, Rob Cluxton wrote:

Where are your GPS antenas located? 30cm away from GPS antennas AND the
compass is not realistic in most gliders...

How can the compass interfere with the GPS signal?

I'm not sure but here is a quote from the manual:


"The PowerFLARM® and any associated aerials should be located as far
away as possible -- at least 30 cm (1 ft) -- away from any other GPS
aerial and the magnetic compass."


The PowerFLARM would interfere with the compass, not the other way around.
The paragraph in the manual immediately following the quoted one makes this
clear:

"After installation, an inspection must be made to ensure that the
device does not interfere with any mechanical, electrical,
electronic (radio) or magnetic (e.g. compass) system, and this
fact must be recorded in the aircraft documents."

As a pragmatic matter, if the unit has to be placed within 30 cm of the
compass (and even if it isn't,) then simply turn it and all other
electronic flight equipment on and make a note of the magnetic deviation
using the usual procedure. It's a portable device, so such a note probably
woudn't be made on the permanent deviation card.