That's the BG96 and many GPS receivers - it's called 'time to first fix'. You can download ephemeris and other data and load it into the BG96 for faster first fix. Again, error 516 is from the BG96 - it says it hasn't got a fix yet. I'm not sure what the BG96 does once its got a fix then you turn the GPS off then back on again - does it have to wait for a first fix or is it near immediate? Something I'll try in the next few days.
Did you ever get it working with AT+GPS=4? It never worked for me.
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