Navionics iPhone iPad marine charts TINY PURPLE DUCKS

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Marinero52

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How do I remove this grid of little purple birds overlaying the marine charts on my iPhone? .... especially annoying when zoomed in.
 
Listen, I am sorry. Really sorry. But I was so relieved to see that your message was not some kind of spam after reading the title I had to do something. So here's my suggestion for the TINY PURPLE DUCKS:

williswharf4c.jpg
 
On a more serious note, I just looked at the Navionics app on my iPhone and did not see what you are asking about. I couldn't find a way to get them on there, either. I do hope someone can help you figure it out.
 
I wish you wouldn't do that, I got laughing so hard I pulled something in my chest. LOL

Thanks for the laugh.

Bill Kelleher


TyBoo":yo7lja20 said:
Listen, I am sorry. Really sorry. But I was so relieved to see that your message was not some kind of spam after reading the title I had to do something. So here's my suggestion for the TINY PURPLE DUCKS:

williswharf4c.jpg
Click to expand...
 
It turns out these mark a marine sanctuary: the whole coast of South Florida out 3 miles. I did like your miniature shotgun idea....

Can you tell me why there ae two times (hr:min AM/PM) stated on the tide graph? The time displayed at the top differs from the one at the bottom by nearly an hour for the same event: high or low tide. How can this be?
 
Marinero52 are you new to boating? The tide differential time is due to the natural diurnal tide cycles which move by about an hour a day. To some degree this is also associated with the cycle of the moon, which influences tides. Suggest you read up in Chapman's Seamanship or Wikipedia on tide cycles.

There are some waterfowl sanctuary areas--but mostly in the Everglade park, not the entire S. Coast of Florida.

Welcome aboard.
 
Yes, I was new to boating in 1955. I am asking why there are two different times to describe the same two high tides and two low tides on a specific date. It cannot be low tide today at both 2:05pm and 3:17pm. Which clock is to be believed? the upper or lower one in the Navionics window?
 
What specific area are you looking at: i.e. tide station?

The Navionics tide page shows current time and date in the right upper corner. left upper corner shows the current tide state and if the tide is rising or falling.

For example I am Vaca Key--the tide chart at the bottom shows 5:27, .11 feet as as low, with cross hairs at 5:36 PM as the current time. You may be reading the current time and low tide as the same? The high tides are 12:53 PM,
.29 feet for the last high, and 11:49PM as the next high tide, .57 feet

This is pretty much a standard tide table has has been used in print for many years and on the digital charts currently. There are some variations.
 
Marinero52":2hcix4cx said:
Yes, I was new to boating in 1955. I am asking why there are two different times to describe the same two high tides and two low tides on a specific date. It cannot be low tide today at both 2:05pm and 3:17pm. Which clock is to be believed? the upper or lower one in the Navionics window?
Click to expand...

I'd change brands of single malt. Something is amiss with what you are currently imbibing. :mrgreen:

Or possibly, the tide is low at the tide station referenced and corrected by Navionics to be low at the other time at your current location?

I was old in 1955, at least as far as I can remember! Welcome to the Brats!

Charlie
 
One item which one should be familiar is "Chart1" Actually the Canadian is presented better on the internet than the American--but the symbols are universal.

An item in magenta generally represents a warning, information or restriction. The magenta bird is a bird sanctuary--but this may be used for any other sanctuaries also--such as whale. For example the Monterey Bay, Olympic Coast, Channel Islands etc Marine Sanctuaries are also marked by these same marks. This includes the Florida Keys East and West, which are the areas that Marinero 52 is asking about. There are many small symbols which we may encounter and should know.

In these cases there are also magenta lines representing the boundaries of these sanctuaries--at some places are within 3 miles of the coast--but may cover other large areas such as Florida Bay South of the Everglades.

Not a bad idea to have the Chart 1 downloaded on the boat computer, then you can look it up, when you find an unusual symbol that you do not recognize. Navionics is good at showing these symbols--which some of the other navigation programs do not show. However these are important, because of specific restrictions which may be present in that sanctuary.
 
Marinero52":399mnsfi said:
How do I remove this grid of little purple birds overlaying the marine charts on my iPhone? .... especially annoying when zoomed in.
Click to expand...

The magenta birds also show up when I use the Navionics PC program to look at their charts. The birds do not appear on the NOAA electronic charts or the charts (also NOAA) that are viewed using ActiveCaptain on my Android phone.
 
I have had a series of PM and e-mails with Marinero52. Dave is a very experienced and respected yachtsman and he has several valid questions.

He was asking about the Biscayne Bay and offshore area. The purple ducks are shown by Navionics in their charts in areas which have various restrictions--and are a standard chart symbol. Biscayne Bay has several restrictions--and Dave may correct me on this: There is Biscayne Bay National Park, There is also the East Florida Coast closed area by National Fisheries (see 50 CFR 622.35)--and there are multiple regulations in these areas. It appears that Navionics is being proactive in warning mariners of those regulations.

The Tide issue was a bit more difficult me to understand, and became clear only after Dave sent me a screen shot of his i phone which illustrated the problem. To understand below, it is best to have Navionics open on your i phone or i pad.

To check on various tide stations, go to the chart, and place the cross hair cursor over the "T" in a diamond box. This will bring up the specific tide station. Touch the "?" mark and the tide picture will come up (You can also do this in your current location by clicking menu, then selecting weather and tides , which brings up a screen which shows sunrise/sunset, current wind direction and velocity,current tide status and nearest current station's data.
If you touch the tide data it will bring up the tide data discussed below.

You have a window which shows the right upper corner of the current time and date, the left upper window the current tide state and if it is falling or rising. The bottom is a tide graph. The current time is shown by a long vertical line, centered on a circle with cross hairs. You can move the cross hairs along the tide curve, and get the tide status at any time during the next few days. What was confusing is that the time in the right upper corner, is the query time--and it can appear that the cross hairs are at the low tide, yet be slightly off from the the printed low tide under the graph.

Here is what I wrote to Dave, once I found the correct tide station, based on the screen shot he sent to me of a low tide projected to be on March 12 PM.

My interpretation of the screen shot: Upper left--current state of the tide is -.39 feet and falling, Upper Right--queried time and date 3:54 PM Tuesday March 12 This a projected reading of tide in the future; your explanation of mechanical issues is correct, because of the small screen of the i phone and size of the human finger). The cross hairs are near, but not precisely at the low tide point. When you go to the "detail" page, (right upper corner box) it will show you the time of High, Moonrise,Sunrise, low, high etc.

As I casually run the cursor (cross hairs) along the tide line, it looks like 4:25 (the query time) would be low tide--But, go to the detail page, There it confirms that the High is at 10:19 AM, and low at 4:33 PM. Moving the cross hairs very slowly (mm by mm), it shows that the "low" of -0.45 lasts from 4:22 PM to 4:37, even on an I pad, and using a stylus rather than the finger on the smaller screen of the i phone. The "time" appears to be in 3 minute intervals--not minute by minute--so it is a bit deceiving.

My initial impression was that you were looking at a current time picture, where the right upper "time" is the current time.

So thanks to Dave, who brought up several vexing questions--and we are all better informed!
 
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