Silva 58 as permanent compass?

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richmatt
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Silva 58 as permanent compass?

Post by richmatt » Mon Jun 05, 2017 9:37 pm

Folks,
whilst I have a recess to take a Silva 80 compass on the boat I am wondering about the 58 as a cheaper alternative..has anyone installed one as a permanent fitting as an alternative to the four-bungees to the decklines? I can find no illustration online of the underneath to be able to see how the bungees attach to it., I guess holes as one online retailer does say it can be screw fitted?
many thanks

Richard

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MikeB
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Re: Silva 58 as permanent compass?

Post by MikeB » Mon Jun 05, 2017 9:52 pm

Might this give some insight? https://flybubble.com/silva-58-kayak-compass

But, while it's cheaper, it's also rather smaller - and thus more difficult to read as it'll be mounted rather further for'ard than most folk would mount a 58 using bungee. Assuming you have the usual recess provided in most modern boats, by the front hatch, it's intended for what used to be known as a Silva / Garmin 70P, which now seems (as you note) to be a 100P

sleepyfolk
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Re: Silva 58 as permanent compass?

Post by sleepyfolk » Mon Jun 05, 2017 10:20 pm

The front recessed compass is a 70p , the 100p is designed to be mounted into a vertical bulkhead surface I think

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EK Sydney
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Re: Silva 58 as permanent compass?

Post by EK Sydney » Tue Jun 06, 2017 2:15 am

You just unscrew the 58 baseplate, take off the bungees, and use your deck bungees instead, before screwing on the baseplate again. It allows you to put it where you want it, rather than being proscribed a set position that may or may not be suitable due to your eyesight, sail mounting point etc etc. You can also easily take it off your oat & swap it to another without any holes being drilled.

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MikeB
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Re: Silva 58 as permanent compass?

Post by MikeB » Tue Jun 06, 2017 10:31 am

MikeB wrote: Silva / Garmin 70P, which now seems (as you note) to be a 100P
Belay that - the numbers refer to the size of the "card". 70 = 70mm - 100 = 105mm. http://silva.se/product/compasses/marin ... 70p-silva/ and http://silva.se/product/compasses/marin ... e-compass/
sleepyfolk wrote:The front recessed compass is a 70p , the 100p is designed to be mounted into a vertical bulkhead surface I think
On digging a bit, it seems that both will mount vertically, or on an angled surface (as with the mounting on a kayak). Unless the op's mount is significantly different from most boats, what is needed is a 70, not the 100.

richmatt
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Re: Silva 58 as permanent compass?

Post by richmatt » Tue Jun 06, 2017 10:48 am

Thanks for the replies, yes I should have stated "70" rather than "80" and thanks for confirmation that that is the size of the card.

Thank you EK Sydney for the advice that it can be mounted on the boats own decklines, a good solution that is not mentioned by Silva or any of the sellers' websites. That might be the way to go.

dowdrey
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Location: Cornwall

Re: Silva 58 as permanent compass?

Post by dowdrey » Thu Jun 08, 2017 9:30 pm

If cost is the main driver and you don't mind a bit of fiddling about, you can get an excellent compass for less than £9 online here
https://www.amazon.co.uk/compass-SODIAL ... navigation
After some disassembly you can get out the compass hemisphere
Image
and with a little fiddling it can look like this mounted in a Scorpio LV.
Image
Also available in black here
https://www.amazon.co.uk/d/Marine-Water ... NQDSXFMKKK
Same disassembly but different fiddling to retrofit to a Shrike shown here.
Image
Image
Both versions work well.
Happy to send / post details of the disassembly an fiddling if folks are interested.

richmatt
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Joined: Thu Oct 22, 2009 9:48 pm

Re: Silva 58 as permanent compass?

Post by richmatt » Thu Jun 08, 2017 10:52 pm

Thank you dowdrey, I'll give that a go.

Phizz4
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Re: Silva 58 as permanent compass?

Post by Phizz4 » Sat Jun 10, 2017 9:28 am

I have mounted that model of compass onto the front hatch cover using 3M Marine adhesive, and added a reflective lubber line so I re-fit the hatch cover the correct way.

Mike A
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Re: Silva 58 as permanent compass?

Post by Mike A » Sat Jun 10, 2017 11:02 am

Dowdrey, that looks great.

It makes you wonder how silva can charge so much more.

Nb, please post the mod instructions.

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