Not necessarily. As the pirates most certainly use non-military GPS, it can be jammed or even spoofed without disturbing the rest of the region’s traffic too much, as far as I know, and I bet Navy ships are somewhat equipped with Electronic Warfare devices. If the ships in place there were spoofing the signal, they could have navigated the pirate ship anywhere, really.
And as soon as the pirates realize this (if you’re not totally stupid you will notice after enough time), they will backtrack to avoid running into a carefully engineered trap.
Specificaly jamming one unit would require a ship with the jammer, following the German ship, all the way from Somalia, in one of the busiest shipping lanes on the planet.
Unlikely.
Understatement of the year.
Understatement of the year.
Though all they really should need is a compass and a chart and, importantly, the ability to use them.