I'd welcome opinions on Iridium. I bought some because it looks cheap and the make a profit but sell for a fraction of book value and have better than half the share price in cash.
Some risks are that they have expenses and uncertainty coming up in the next two years with the deployment of new satellites and they've backed off their outlook forecast. Their assets are not the most liquid; not just anybody will take a satellite off your hands.
By comparison, though, GSAT is selling for P/S = 7 and they're losing money while IRDM is selling for just over P/S = 1
After a quick review of the key statistics, I would agree with your assessment that IRDM looks cheap especially in comparison. However, you have to take into consideration that IRDM pulled forward guidance due to some weakness and GSAT looks like it will get some of its frequencies approved for new use which will increase its value. I don't know anything about the industry to place and value to the importance of each of those events but need to be considered.