SiriusXM's new aviation receiver, the SXAR1, is an affordable way to add high quality weather to your iPad. One of the major differences between the SXAR1 and ADS-B receivers like the Stratus is that SiriusXM weather is delivered by satellites, so it's available at all altitudes and all across the United States. That means it requires a subscription, but most pilots don't know that SiriusXM offers some flexible subscription plans. Here are some options to consider.