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On 12/4/2013 8:10 PM, Nial McInerney wrote:
> I should also mention that iPhones worked well for me all over the
> Eastern Caribbean so what happened in the Atlantic was very strange..
> Nial

After several issues with my marine unit (one area in farm land)
multiple times in my automobile, then the road unit in my car, it came
down to either a large number of microwave towers in the agricultural
area for the marine unit, or the car radio (FM) for the road unit.

The discussion group (aka list) suggested that something as trivial as
the radio station I was listening to could interfere with the relatively
weak GPS signal. (My favorite station changed formats, and I picked up a
new favorite about that time. Additionally I was far from home so
listening to a local broadcast. I have not attempted to correlate
frequency with loss of signal yet.)

Eventually I moved from a windshield mount for the Garmin road GPS to a
dashboard mount (for legal reasons) and I can locate a position between
the radio and speakers that is 95% good. Otherwise, shut off the radio
if I require GPS and the unit re-acquires the satellites in seconds.

That said, I humbly suggest that it may not be the ship's location, but
rather that ship's electronics and antenna arrays and/or your position
on the ship.

   

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