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Old 06-13-2013, 04:28 PM   #1
gregmaustin
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GPS Question

Hey, I was looking at the GPS chart I have on the boat. And had a question about the chart.

I took a screen shot of it, those numbers that say "18" 21" "15" "09"

I know thats not depth, I know how deep it is over there and its not that deep. What do they mean?
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Old 06-13-2013, 04:30 PM   #2
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Not sure but I would guess 1'8" or 1.8 feet dee.
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Old 06-13-2013, 04:33 PM   #3
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I dont know but I like the "Not to be used for Navigation" disclosure!
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Old 06-13-2013, 04:33 PM   #4
gregmaustin
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I didnt think it was that shallow either. Boy do I feel dumb. lol
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Old 06-13-2013, 04:35 PM   #5
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its not of my GPS lol. I bought the maps from Navionics but they have maps on there websites you can see.
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Old 06-13-2013, 05:03 PM   #6
gman1772
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That lower number is referencing a legend (instructions) somewhere on that map. "Read the instructions" even for a map.
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Old 06-13-2013, 07:54 PM   #7
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Size

Quote:
Originally Posted by gregmaustin View Post
Hey, I was looking at the GPS chart I have on the boat. And had a question about the chart.

I took a screen shot of it, those numbers that say "18" 21" "15" "09"

I know thats not depth, I know how deep it is over there and its not that deep. What do they mean?
Thats the size of the trout in that area of East Bay. You need to find some 24's and 25's on that map and stay away from those 1's and 0's.....n Gater
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Old 06-13-2013, 10:04 PM   #8
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Quote:
Originally Posted by gater View Post
Thats the size of the trout in that area of East Bay. You need to find some 24's and 25's on that map and stay away from those 1's and 0's.....n Gater
Where is the "Like" button?
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Old 06-13-2013, 10:33 PM   #9
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Quote:
Originally Posted by gregmaustin View Post
Hey, I was looking at the GPS chart I have on the boat. And had a question about the chart.

I took a screen shot of it, those numbers that say "18" 21" "15" "09"

I know thats not depth, I know how deep it is over there and its not that deep. What do they mean?
its the sounding dep of that area
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Old 06-13-2013, 11:36 PM   #10
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Stealth is correct. They are sounding readings. On NOAA charts those numbers represent fathoms(1st number) and feet (2nd lower case number). You may be able to check your depth finder manual or Navionics to see if you can change the depth readings to feet. You can download "U.S. Chart No.1" from NOAA to see all of the legend information for almost every nautical charts.
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