I have gotten comfortable with getting a 6 satellite lock and taking off as I almost always add 2 to 4 more in the air with in seconds after lift off. Altitude help tremendously If winds are light to none I take off with 5 even in close quarters. As you get past the jitters, you will calm down and this won't be a big deal at all.
New Phantom pilot: Sits on the ground counting sats. gets mad and may or may not even take off, if he does he starts with video recording blades of grass or black top up close, gets in the air adds a few satellites to maybe 8 or more and likely never has a problem.
Experienced Phantom pilot: Powers up watches led signals or FPV for sats, likely lifts off with 5 or 6, hovers in the air briefly well knowing more sats will come in with the added altitude, decides when it is time based on telemetry info. then starts his video capture, and flys off for another successful flight with 8 or more sats also.
I'm not picking on anyone here cause I am in the middle now at best but this is kinda how it is and how it works with a $1200 toy airplane. Good GPS's can cost more than that !! I got one on my boat that cost 3 Phantoms, These are not precision instruments regardless of what some people think that you should to get for $1200 and you do have to play with them a little to figure out how to work with them best, to get the most out of them.
Do I think it should be or wish it was better out of the box ...sure, at least should have more shielding !! I was considering the NAZA M Lite external antenna and think it would give great results but at $169 but as I am getting used to how it all works I am not likely to feel I need to go there.
The are expensive toys and we all want perfection with every purchase but consider all the technology packed in these little birds starting at $500 and it is amazing !!!