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I thought this EPIRB business looked interesting... so I've done some research..
The UK Sea marshall is spec'd as follows :
Frequency 121.5-243Mhz
Power Output 25mW radiated minimum
Modulation Swept Tone
Duty Cycle 2-1
Temperature Range -10�C - +60�C
Battery PP3 high capacity replaceable
Endurance Minimum 6 hours at -10�C
Normal 12-14 hours
Immersion Waterproof, Buoyant
Dimensions (PLB-7) 73mm X 70mm X 29mm
Dimensions (Tuff box) 105mm X 11.3mm X 73mm
Approval European Telecommunication
Standards ETS 300-152
Intrinsically Safe ExN 11CT4
So.... 25mW @120 Mhz..... I seriously doubt this is going to hit a satellite !
I would accept that it would be receiveed by SAR aircraft, and the sea marshall
site, quotes
a distance of 3 miles for that purpose..
So, the two remaining questions..
1. Is it any good to use as a 'First Alert' tool
2. Is it any good to use for location after a 'First Alert'
I would think the answer to 1 is that its a bit hit & miss
(Be interesting to hear from professionals in the SAR field)
and the answer to 2 would be ... definitely !
Which only really leaves the question of what sort of dives its suitable for...
I would
suggest it looks like dives where you have some other pre-defined first alert
method..
Seems to me you can't beat the technique of someone expecting you back.
I would think from all this that the Sea marshall has its place, but
that you might have to expect a long wait in the water (time from first alert
to location etc)
Zak
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