I agree there is no other way to sensibly keep the site up to date.
The 'new'
GNAS site has been up and running for months now - plenty of time for all clubs to have input their contact information in.
Our info went in to the site in about May/June - soon after the site was completed, there are still a large minority still not there!
It is really easy to do and takes about 5-10 minutes at the start - and a couple of minutes each month to maintain,
Dave