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Old 05 September 2008, 04:38   #11
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I use memory map with OS maps on a mio 550, battery life is poor, about 2 hours with the gps on.
It shows the coastline clearer than bluecharts.... beaches, PO, pubs, bay names heads etc.
Awesome on the PC as well, with some maps you get to 3D view your route, if only I was a rambler!!
But, as mentioned, no depth soundings.
The mio also runs tom tom for the car which shows petrol stations (useful for the RIB?)
Can check email using bluetooth and gprs plus browse the net in a kind of early 90's type way.
All in very useful (cannot remember exactly who recommended it but it was of rib.net ) thanks for the tip.
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Old 05 September 2008, 08:03   #12
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I'd put my faith in large scale charts from Imray or the Admiralty. I find them fine to navigate around tidal estuaries / inshore waters in South Devon.

I'd apply some common sense rules as well until I knew a stretch of water, for example don't explore anywhere for the first time on a falling tide, watch what lines other craft follow (as along as they ae not of shallower draft!).

If your main stamping grounds will be the Teign, Exe, Dart and Torbay, main and secondary channels are generally marked, and there is local knowledge from harbour authorities / yacht clubs etc...

If your RIB is relatively small, like mine, there isn't much room for lots of electronic aids.
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Old 05 September 2008, 09:15   #13
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Quote:
Originally Posted by tinker View Post
I use memory map with OS maps on a mio 550, battery life is poor, about 2 hours with the gps on.
It shows the coastline clearer than bluecharts.... beaches, PO, pubs, bay names heads etc.
Awesome on the PC as well, with some maps you get to 3D view your route, if only I was a rambler!!
But, as mentioned, no depth soundings.
The mio also runs tom tom for the car which shows petrol stations (useful for the RIB?)
Can check email using bluetooth and gprs plus browse the net in a kind of early 90's type way.
All in very useful (cannot remember exactly who recommended it but it was of rib.net ) thanks for the tip.
Prob me - I have set up loads for my mates - should be on a comission!!!
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Old 05 September 2008, 09:42   #14
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Thank you, lots of interesting, and differing, advice!

Yes, charting was covered in the course and I admit I need a refresher but that assumes you have the type of chart that covers rivers etc, and also large charts are not that practical on a small rib especially with a few people on board.

GPS devices sound good but I guess are limited use without a seperate depth sounder which, on a small rib is not really practical.

I hadn't considered Google Maps and that actually is a pretty good idea as I have phone which runs the Google mobile apps on it.

I think that talking to the local clubs/harbour masters is great advice too.

Just shows that many people use many different ways to do the same thing doesn't it!

By the way, 3 weeks after buying a 3.6m Rib I'm already lusting after a bigger one... is this normal ;-)
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Old 05 September 2008, 11:17   #15
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By the way, 3 weeks after buying a 3.6m Rib I'm already lusting after a bigger one... is this normal ;-)
YES!!!

I have a similar problem to you. I use a handheld GPS but it only has limited base maps. I buy Admiralty charts and cover them in sticky back plastic and then put them back into their pastic wallets to keep them from getting wet.

The difficulty I have is that the charts don't go far enough inland. I have been known to consult google earth before I go, as the images are sometimes taken at low tide - just remember that sand banks move!
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Old 05 September 2008, 14:45   #16
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GPS devices sound good but I guess are limited use without a seperate depth sounder which, on a small rib is not really practical.
Disagree on both counts. I use small handheld gps (with chart display) for normal navigation on a boat only a smidgen bigger than yours. The chart shows depth (at astronomical low tide) so you always have ATLEAST that much water (except in very extreeme circumstances). If you want to take a route across an area that dries at low tide then its time for the tables and the rule of twelfths etc. I would have bought a small plotter if I had enough spare . I don't have a depth sounder as I don't consider it essential, but it is perfectly feasible to put one even on a small boat. you can get sounders which are integrated with the plotter display so it takes up less space on the console.
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Old 05 September 2008, 16:32   #17
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I have always used os maps in small boats canoes etc , When i did adv sea prof years ago in a sea kayak we had to do a micro nav at night very close to shore using an os map and compass as part of the test . We used to write any chart info we needed on the os map . It was far more use than a chart
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