I think we are talking about day VFR here, Justin.
I've got 4 GPS units in the BD-4,all with their own internal battery backup.
I'm  a fan of "train like you will fly, fly like you trained." In 2015 the 
answer to a GPS failure is another GPS. If the entire satellite constellation 
fails, the human race has got other problems and your little navigation problem 
pales into insignificance.
Yes, Chris, it is a requirement to put a new glider on the register. It still 
is a stupid requirement in 2015. Like many rules in aviation, it isn't there 
for your or my benefit. It is there to provide arse cover for the people making 
the rules so they can continue to collect their pay.
At very least the rule should be a magnetic compass is required unless the 
glider has two GPS units and batteries or at least one GPS has internal battery 
backup.

Mike



> On 6 Jan 2015, at 5:03 pm, Justin Sinclair <[email protected]> wrote:
> 
> True Mike very true, unless
> 
> You have a total short whilst in cloud that fry's everything else.
> 
> I that case you are going to thank Christ (or what ever your mythical friend 
> is ) your old instructor taught you ONUS.
> 
> Unless you have a AHARS GPS the update rate is way to slow to fly limited 
> panel on.
> 
> Just SAYIN 
> 
> JJ
> 
> 
> Justin Sinclair 
> 17 Queen st
> Scarborough 
> Qld 4020
> 
> Mob 0421061811
> Hm 07 3885 8949
> 
> Sent from iPhone 
> 
> 
> 
>> On 6 Jan 2015, at 19:53, Mike Borgelt <[email protected]> 
>> wrote:
>> 
>> Obsolete instrument mandated by the Regulator. In gliders mainly used to 
>> fill instrument hole that could be used for something useful.
>> In high wing powered aircraft can be used as attach point for pair of fluffy 
>> dice which are about as useful.
>> 
>> Mike
>> 
>> 
>> 
>>> On 6 Jan 2015, at 4:39 pm, Mark Barnfield <[email protected]> wrote:
>>> 
>>> What’s a compass?
>>>  
>>> From: [email protected] 
>>> [mailto:[email protected]] On Behalf Of Tom & Jane 
>>> Gilbert
>>> Sent: Tuesday, 6 January 2015 7:13 PM
>>> To: Discussion of issues relating to Soaring in Australia.
>>> Subject: Re: [Aus-soaring] Compass Swinging
>>>  
>>> Hi Chris,
>>>  
>>> There are a few methods but the easiest is as follows...
>>>  
>>> 1.  Using a master compass (a good bush walking compass will do) align the 
>>> glider North South.  (This should be done well away from any hangars with 
>>> power on and  instruments running)  Using a non magnetic screwdriver, 
>>> adjust the compass to North.
>>> 2.  Align the glider to South using the master compass and halve the error.
>>> 3.  Repeat in East West.
>>> 4.  Align the glider to all the cardinal headings (ie, every 30 degrees) 
>>> and record the indicated heading.
>>> 5.  Complete the correction card.
>>>  
>>> Using this method you should be able to get to within 2 degrees on every 
>>> heading (not always but usually).
>>>  
>>> Regards,
>>>  
>>> Tom
>>>  
>>>  
>>>  
>>>  
>>> From: Chris Runeckles
>>> Sent: Tuesday, January 6, 2015 6:15 PM
>>> To: Discussion of issues relating to Soaring in Australia.
>>> Subject: [Aus-soaring] Compass Swinging
>>>  
>>> Hi sailplane drivers.
>>>  
>>> Has any one got a procedure for swinging glider compasses, or a link to a 
>>> web article would be good?
>>>  
>>> Many thanks
>>>  
>>> Chris Runeckles
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