Ramy

Spot uses the Globalstar L-Band simplex links. L-band is relatively
immune to rain attenuation, rain/water droplets suspended in storm
clouds are likely the worse case scenario. A guess for bad rain
attenuation might be something like only a dB or so at L-band. The GPS
signals are in the same frequency bands and will have similar
attenuation. So my first guess is clouds, even storm clouds are not
likely to be the issue.

So the next question is did anybody else flying in the genral area
have the same problem? I was flying in the Mendocinos at the same time
and had no SPOT problems but that is probably far enough away to not
count, except to exclude more systemic problems. The next question is
did the unit have a full view of the sky or are you still mounting it
on your parachute harness? I'm not sure if this is on your shoulder -
in which case your head (hopefully opaque at L-band :-) ), RF opaque
parts of the fuselage/canopy frame area, etc. will be obscuring lots
of the sky, or vertical on your harness in which case far more of the
sky will likely be obscured. Both of these will affect coverage as
Global star satellites fly into and out of the now fairly restricted
sky view or as you turn the direction of the obscured antenna to bring
Globalstar or GPS satellites into view.

I think SPOT is fantastic, fly with one all the time in SPOTcast mode,
but I'm not giving up on my 406MHz PLB on my parachute harness.

Darryl

I have a SPOT on order. Where is the best place to mount it so it has a
full view of the sky (excluding the top of the glare shield)? Will it
work under a fiberglass glare shield?