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post #21 of 25 Old 03-16-2013
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Re: Cellphone Nav?

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Using the Mark I eyeball as a navigation tool seems to be becoming a lost art.
And it doesnt 'go down' when youre struck by lightning and all your gizmos get 'fried'. Been there, got the Tee shirt. :^))))
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post #22 of 25 Old 03-16-2013
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Re: Cellphone Nav?

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BTW - I also use a lead line to measure the depth under my rudder when anchored stern-to shore.
OK Jack.... Maybe you should spend $100 on a handheld depthsounder for that..

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post #23 of 25 Old 03-16-2013
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Re: Cellphone Nav?

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..BTW - I also use a lead line to measure the depth under my rudder when anchored stern-to shore.
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OK Jack.... Maybe you should spend $100 on a handheld depthsounder for that..
Funny, I did the same at a mooring field this past season. I have to take an outside mooring to clear our 6.5ft draft. I look at the depth sounder after the tide goes out and it reads 6ft!! I think we're still swinging? I drop a line and find about 7ft, which makes sense. The sounder must have been distorted by the notorious thick grass at this anchorage.


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post #24 of 25 Old 03-16-2013
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Re: Cellphone Nav?

There is an easy way to determine whether your GPS capable cell phone would work as a GPS when out of reach of cell towers. Just put it into "airplane mode," then manually turn on the GPS functionality. Test it with a freestanding chart plotter program (like Marine Navigator Lite on Android) and see if it gets a fix.

Do not do this test with Google Maps, because it has to download its maps over the internet. Some chart plotter programs also requires internet connectivity to download the charts in real time, while others will cache the charts. Some, like NutiCharts, will cache the charts with the paid version, but not with the free version.

Marine Navigator caches the charts with both the paid and free versions.


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post #25 of 25 Old 03-16-2013
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Re: Cellphone Nav?

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Originally Posted by TakeFive View Post
There is an easy way to determine whether your GPS capable cell phone would work as a GPS when out of reach of cell towers. Just put it into "airplane mode," then manually turn on the GPS functionality. ....
In principal, I get what you're saying. However, I don't think the iPhone has a separate gps switch, just a wifi and bluetooth. If you sent set it to Airplane Mode, the gps is shut off.


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