GPS Coordinates
How many places do you need carry past the decimal point.
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Posted on Monday Sep 9, 2013 at 4:30 PM  
I have a question about taking GPS coordinates off of aerial photos and entering them into my HDS 10 and 8.  

The question is how many decimal points necessary to get me close enough to find rock piles, brush piles, and bridge piers? For example 34.57392, 96.18472 or is it accurate enough to shorten it to two or three numbers passed the decimal point?

Later I will have to figure out how to enter them on a chip.
Posted on Tuesday Sep 17, 2013 at 10:22 PM  
Pat, not sure I can answer in a post, here on the notebook. I need to get out my unit and look. I can tell you it has nothing to do with decimal places but Lat./ Lon. format. Where are you located? Sorry it took me so long to notice this post. You've probably already figured it out.
Steve Carroll Hybrid/Striper Guide Skiatook Lake Fishing Guides, Lowrance Pro Staff, Zebco Brands Pro Staff, Yeti Pro Staff, Costa Del Mar Pro Staff, Mercury/Motor Guide Pro Team.





Posted on Tuesday Sep 17, 2013 at 11:00 PM  
Press Pages, go to Settings, then System, then Coord System, set that to Degrees. Enter your Lat/Lon and give it a name. I've named that spot "104"
Steve Carroll Hybrid/Striper Guide Skiatook Lake Fishing Guides, Lowrance Pro Staff, Zebco Brands Pro Staff, Yeti Pro Staff, Costa Del Mar Pro Staff, Mercury/Motor Guide Pro Team.





Posted on Tuesday Sep 17, 2013 at 11:27 PM  

Steve Carroll Hybrid/Striper Guide Skiatook Lake Fishing Guides, Lowrance Pro Staff, Zebco Brands Pro Staff, Yeti Pro Staff, Costa Del Mar Pro Staff, Mercury/Motor Guide Pro Team.





Posted on Wednesday Sep 18, 2013 at 2:34 PM  
Steve my question probably was not very clear so I'll try to do a better job explaining what I am trying to do.

The aerial photos on Google Maps are updated every so often and sometimes the lakes are at there lowest levels in several years exposing structure both man made and natural, but it is rare that this happens at the right times so when it does I would like to document some of these areas for later use. Things like box culverts, rock piles, trees, brush piles, and old road beds can be scouted with these photos and help eliminate time on water if accurate data can be collected and entered into the electronics. 

An example of what I am talking about is Broken Bow photos were taken while the lake was down possibly 10' to 12'' exposing humps that are covered when the lake is at or near normal elevation. Some of these show up on topo maps but it would be an advantage to locate them with GPS coordinates and store them somewhere other than my memory. Over the last 30 years I have caught a lot of big crappie on this kind of humps in water 10' deep or less in the spring time and being able to find new ones by setting at a computer saves a lot of time and gas. However I have no idea how accurate these positions will be taken from an aerial photo but it is wort a try.

As I was going over the lake and righting down coordinates to keep it became clear that a lot of data entry would be involved to enter all the spots selected into the computer which brought me to the original question. 

For example in the last picture you posted the coordinates were N 34.57392, W 96.18472. If this is shortened to N 34.573, W 96.184, how much does this increase the margin of error? 

Another question also came to me is how many waypoints will the Gen 1 HDS units store?

Posted on Wednesday Sep 18, 2013 at 3:53 PM  
Do not shorten them!! Thousands!!
Steve Carroll Hybrid/Striper Guide Skiatook Lake Fishing Guides, Lowrance Pro Staff, Zebco Brands Pro Staff, Yeti Pro Staff, Costa Del Mar Pro Staff, Mercury/Motor Guide Pro Team.





Posted on Wednesday Sep 18, 2013 at 6:54 PM  
Thanks Steve, I figured out it was a dumb question after looking at a lot of way points. Now I have to decide how many I want to enter into the HDS units. I think that will be something to do this winter.
Posted on Wednesday Sep 18, 2013 at 9:18 PM  
That would be an excellent winter project. go to Radio Shack and get a 110v to 12v adapter and a spare power cord for your HDS. Hook that up, and do the deed sitting in your easy chair in front of a fire.
Steve Carroll Hybrid/Striper Guide Skiatook Lake Fishing Guides, Lowrance Pro Staff, Zebco Brands Pro Staff, Yeti Pro Staff, Costa Del Mar Pro Staff, Mercury/Motor Guide Pro Team.





Posted on Thursday Sep 19, 2013 at 3:45 PM  
I have Map Create 7 on my laptop and planned on putting them in it and then on an SD card to transfer to the HDS. Although it has been a long time since I tried to use it and may have to deal with the learning curve again.

Which way would be the easiest. 
Posted on Friday Sep 20, 2013 at 12:23 AM  
It's been too long for me to remember how the Map Create product works. I would load them right in to the HDS. Skip the SD Card step. Laptop on one leg, HDS on the other leg, bowl of popcorn on my tummy. Fire in the fireplace.
Steve Carroll Hybrid/Striper Guide Skiatook Lake Fishing Guides, Lowrance Pro Staff, Zebco Brands Pro Staff, Yeti Pro Staff, Costa Del Mar Pro Staff, Mercury/Motor Guide Pro Team.





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