As regards to GPS antenna, a version can be bought which still receives signals through heating elements in A/C windshield. They have been around for years and I believe they have a "boost" current from the portable GPS it self.
I started using a portable GPS in A/C pre 1990 and before they were "banned." Yes it did interfere with the nav equipment in a way, as it was far far Superior than Omega or INS (litton 52's) The portable GPS was and still is mandatory standby equipment for me, pre and post ban.
As for the crew apparently getting lost due total nav failure. What about the standby compass?? That is just about the only instrument in the A/C that can be rely ed upon to give correct readings when all else fails. What would have been wrong with steering flight plan headings, as was pointed out in an earlier post, or is it the case that going back to basics are not taught anymore.
Last edited by doubleu-anker; 13th Feb 2006 at 19:47.