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Old 28 August 2014, 13:44   #51
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Quote:
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?).
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Originally Posted by Copinsay View Post
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
seconds.
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.


Quote:
Originally Posted by Peter_C View Post
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...
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Old 28 August 2014, 16:35   #52
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Originally Posted by Peter_C View Post
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.
Sorry I forgot to mention, as Shiney suggests that was a while back, 24yrs,
blimey we only had Decca navigation system and paper reel sounders back then, and the compulsory VHF being commercial vessel of course,
there where some posh yachts fitted with the newer LORAN and GPS plotter systems, but we considered that cheating!
I did however, talk the boss into fitting radar eventually, marvelous piece of kit, especially for crossing shipping lanes in heavy fog.
But the majority of private boaters didn't have anything other that VHF at the time.
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Old 28 August 2014, 17:55   #53
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Presumably if you have a "Nautilus Lifeline VHF" you still need a licence (free) and certificate (training/competency exam paid for) to use it?
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Old 29 August 2014, 03:47   #54
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Hi

Thanks for the replies. It was a very interesting read.

Since the radio was the last safety item to buy, I ended up with a new half decent one. I've also booked up to attend a radio course.

I am quite looking forward to it all

Roger ... Roger.. Over and out :-)
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Old 29 August 2014, 04:16   #55
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Glad it was helpful and pleased to hear what you've done.

And once you've done your VHF course you'll need not say....

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Originally Posted by calibra View Post
Over and out :-)
... ever again :o)

Best wishes

Steve
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Old 29 August 2014, 05:11   #56
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Not completely off thread, if you're after a fixed vhf have a look at the new standard horizon with the built in gps, buy it in from the states for about 130, very small, I've handled one, it's not a bad bit of kit
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Old 29 August 2014, 13:02   #57
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Not completely off thread, if you're after a fixed vhf have a look at the new standard horizon with the built in gps, buy it in from the states for about 130, very small, I've handled one, it's not a bad bit of kit

Yeah, it's a great bit of kit - I came close to buying it. The only reason I didn't is because I'm going for an NMEA 2000 network now, and the SH GX1700E is only 0183.


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