Re the recent comments about SkyDemon - I've only just discovered that it is essentially a NATS-commissioned product.
Hi John, it's not a NATS commissioned product at all. Skydemon has been available for about 18 months now (longer if you were a beta tester) to install on PC and mobile devices.
A few months ago a web based lite version was launched in conjunctions with NATS, at the same time as a full featured web based version was launched to the paying subscribers.
I've tried the lite version out and it is good, but nowhere near as good as the paid for version, you can download the full version and install it for a free months trial from the skydemon website.