Tue, 12 May 1998 07:07:00 +0200 - Message No. 2983
>From: ms@mausd.gun.de (Marcel Sieling)

Subject: AW: re hand held GPS units


Hi,

>The reason for the old 160 km/h limit is that Garmin wanted their
>cheaper GPS units to be useless for aviation.

It's because older GPS receivers have 6 or 8 channel serial receivers,
which get into trouble on higher speed. For a save satellite lock on higher
speeds it's necessary to have a parallel receiver, which scans several
satellites at the same time. These parallel receivers were still expensive
a few years ago but now with the GPSII+ and the GPS12 and GPS12XL they have
become quite affordable (144 $ for a GPS12).

take care - Marcello.


dipper@normans.isd.uni-stuttgart.de