Originally Posted by poly
I wonder if you keep your DSC switched off how long it takes to do a cold start and get a sat fix. I assume it will let you send a distress whilst waiting but does the position update once it gets a fix (if I remember correctly the repeat messages stop when the shore station acknowledges?).
Originally Posted by Copinsay
SH HX851 DSC Handheld approx 1 min cold start for GPS fix, 40 seconds for warm start.
Icom M91 Manual says:
"NOTE: The distress call is paused for up to 15 seconds
when no valid position data is received. The distress call
is made when a valid position data is received within 15
• If valid position data cannot be received within 15 seconds, the
distress call is made with a stored position data."
(Position data could be up to 23.5hours ago)
It doesn't seem to give a fix time but from cold less than 15 seconds would be optomistic... So I suspect poly is right you may not send a pos. if its not acknowledged you may get a new pos when resent (and you can manually choose to resend sooner than 4.5mins). But if acknowledged you protobably need to re-hit the red button to send the pos when it fixes...
Struggled to see what the HX851 does. But you can set it to only get a GPS pos every 5 mins to conserve power. That has to be better than 23.5hours old. On a kayak thats probably fine. On a rib doing 30kts thats 2.5NM difference in search location so I think I'd be choosing... the 5second or 1minute updates.
Couple of other things I like about the HX851 - hit red and you can select the distress alert type on that screen rather than burried in the system menu.
Receive a distress alert and it will let you convert to WPT and then give bearing and distance to it.
Originally Posted by Peter_C
And if the divers would have been carrying a Nautilus Lifeline VHF, they would have called their own boat on channel XX and been pickup without incident 15 minutes earlier.
I suspectthat incident wasn't yesetrday... in which case Lifeline didn't exist...