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Old 07 July 2014, 12:32   #21
Country: USA
Town: Seattle
Boat name: Water Dog
Make: Polaris
Length: 4m +
Engine: Yamaha 60hp
Join Date: Apr 2007
Posts: 1,152
Originally Posted by lockieboi View Post
Thanks for all the responses.

I quite fancy a project so I think I'm going to do this.

I've sourced a 7 amp hour Yuasa battery which should be sufficient.

I still have a few questions for all the experts in this field.

Firstly, what size fuses would be required or does it depend on the load?

The output from my OB looks as though there is a plug that should fit it? Ive attached a picture of the output.Attachment 96525
As a general rule...

You want the wire sized appropriately for the load (so it doesn't get hot, burn up, or have too much voltage loss)
The fuse protects the wire for taking more current than you've budgeted for.

My experience with some electronics is that they can be very finicky to poorly regulated or bad sine wave AC power. A phone draws about 15W max so your 7Ah battery will last for days without any charging at all. The problem with using more than the AA lithium battery pack suggested earlier is that its hard to get the charging cord from a larger battery to the phone and maintain waterproofness.

captnjack is offline   Reply With Quote
Old 07 July 2014, 13:24   #22
Country: UK - England
Town: Isle of Wight mostly
Make: Regal
Length: 6m +
Engine: Mercruiser
MMSI: 235911246
Join Date: Oct 2012
Posts: 184
Navionics for the iPhone and ipad is very good, especially for planning.

We did the Macmillan round the island using just an iPhone with navionics (as an elec nav aid) in a car type screen phone holder, with no major issues (charts and local knowledge too btw).

But having played with this for a few months I've found that underway the iPhone at speed is hard to zoom in/out and the small screen is a bit fiddely. It needs a power lead for any extended use and obviously has to be kept dry. We've been ok seeing the screen in the sunshine so far.

The real pity is a lack of interchange between navionics and garmin homeport software.

solent spence is offline   Reply With Quote

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