Here's a question about pulsars.
How long do they "pulse"? That is, how long are their "signature" pulses stable? We don't have any data more than, what, 50 years old? Does it last 1000s of year? 100,000 years?
I only ask because when you start jaunting around the galaxy and are 10,000 light years away from where you though you were due to a truly amazing misjump, would the pulsars that you relied on to help position yourself before still be the same? Because it's now 10,000 years earlier/later/etc. from when your measurements were placed.