Raymarine raystar 120 - how to fix the NO FIX

As last year I empty out the small amount of standing water in my watertank so I can fill on some clean and fresh water in the spring, someting I discover is a lot of sand in my tank, maybe pretty normal but still a bit odd the habor has so much sand in the water system.
In my examination of my navigation equipment I discover that I have to wait a long time before my gps chartplotter find the satellites, and the NO FIX symbol appears for a long time.

In this video I show you why the error appears and how to fix it very cheap.