Depends on how many people know about it and might interprete it as some kind of association. I would be sceptical to use 88 as a designation, at least in Germany. See 4 or 13 for numbers avoided in other cultures (for non-political reasons).
I have no idea why 4 would be special and 13 avoidance is for superstitious people which I'm not one of.
So forgive me if I don't see the problem with the 'Navi 88', in spite of being pretty sensitive to such issues because of what my grandparents went through.
When some kids wanted to do a dance festival under the label 'Tanzen macht frei' I thought it was in pretty bad taste because it clearly intended to be a reference. But just a number is not enough to trigger my sense of indignation.
Nokia 8800
Ericsson GS88
Motorola Focus 88
Seems like marketing people care less about fringe far-right numerology than you buddy.
Seems like their marketing team cared enough about a number.