Aquaman,
I should have thought about this but if the unit has been moved more than 200 miles or it has been more than a few weeks since it last got a position fix than it may take a few minutes to lock onto the satellites as it must download a new almanac (location of the satellites). After this “cold start” the unit should quickly get a position fix when powered on. This is all assuming that the built-in GPS Receiver has a clear view of the satellites.

Let us know how it works for you.