Question about Garmin 152 Map Page

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feenagh
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Question about Garmin 152 Map Page

Post by feenagh » Mon Jul 13, 2009 3:28 pm

I want to set up a drift using the cursor on the Map Page.
I want to know if the bearing given in the data field is the true or magnetic bearing.
Same goes for the tidal flow on the Chart - true or magnetic?
Regards Paul



hammyloz
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Post by hammyloz » Mon Jul 13, 2009 4:41 pm

cant help you there buddy as i use maxsea

tomcat
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Post by tomcat » Mon Jul 13, 2009 5:35 pm

You'll have to refer to the manual for your particular set. The settings in my Lowrance allow the user to set displayed expressed bearings as either true or magnetic. I would expect that your set offers you similar options. The settings section in the Garmins on screen menu, should, with some perseverence guide you to the appropriate page.

feenagh
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Post by feenagh » Mon Jul 13, 2009 7:53 pm

Hello Tomcat
I have had a thorough read of the manual and I can change the bearing on the compass page between magnetic and true but not on the map page.
I will email Garmin on that one I think. Can you tell me if the tidal stream bearings on paper charts are true or magnetic?
Regards Paul

tomcat
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Post by tomcat » Mon Jul 13, 2009 8:10 pm

All charts are in true.
I believe if you make the selection on the compass page the settings will carry over to your map page too.
If it's drifts you are looking to set up for wrecking etc, don't get too tied up with magnetic and true. You usually find the wind has greater effect on your drift track than the differential between mag and true.
Roughly calculate the first drift then watch the track on the plotter screen and use that angle to position your boat for subsequent drifts.
Last edited by tomcat on Mon Jul 13, 2009 8:15 pm, edited 1 time in total.

feenagh
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Post by feenagh » Mon Jul 13, 2009 8:14 pm

Thanks for that George.
Regards Paul

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