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Discussion Starter · #1 ·
That's cool. Something you could probably add to that....If you had a Navionics Premium East map card in that 520C you'd have minute by minute tidal data on the GPS screen. It has some or most of Santee Cooper in real-time surveyed (HD- High Definition) to one foot contour intervals. Check the pools listed for SC here: http://www.navionics.com/PremiumLakeList_07.asp?RegionID=3

Jim
 

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Discussion Starter · #3 ·
Navionics map cards don't work with MapCreate. Between the two I'd get the Navionics first since that's something you'd use every trip. Navionics has their own new mapping program, but so far I haven't seen any reviews of it. I heard it had some bugs at first, which is normal.

HD is unbeatable, made from a live sonar survey covering a lake on a tight grid. Wherever they could get that big loaded Boston Whaler to float safely got surveyed. Really shallow areas are shown without detail, but marked so you know why.

If not HD then the map is the same as we've had for years, based on paper maps and some government sonar surveys. However good the source maps were determines how good the E-maps are. Lake Ouachita has 5 foot intervals on my Lowrance Elite HotSpot map card, none in HD. I doubt Lowrance will get into HD. Navionics is the largest surveying corporation in the world and is set up to handle big projects like that.

Jim
 

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Discussion Starter · #5 ·
Lowrance GPS products work with Navionics and MapCreate. Navionics won't work with MapCreate. IF you mostly fish Marion, rarely Santee Cooper, take a look at http://www.lowrance.com/Products/Mapping/hotspotsPRO/fhsp_east.asp for a cheaper E-map since Navionics doesn't have Marion in HD and they charge $50 more. You just gotta choose or get both. It depends on total lake coverage in each product. Maybe you will find the Navionics map card more useful since it has some of your destinations in HD. If so then get their mapping program (NavPlanner) http://www.navionics.com/NavPlanner.asp if the Lowrance Pro card serves you better get the MapCreate program http://www.lowrance.com/Products/Mapping/MapCreate7/default.asp.

In either case your custom mapping is put on a separate memory card. You can upload that data onto the 520C, but not the base map (Navionics or Lowrance E-maps). You upload the data, remove the memory card, then insert the main map card. The custom data displays overthe E-map. You can't put custom data on the E-map card without destroying the map card.

Clear as mud yet? :lmao:

Jim
 

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Discussion Starter · #7 ·
Well, you have the two E-map links, so go there, look up South Carolina, and see which has the most of your lake coverage. Weigh in the HD coverages in the Navionics. Most of my lakes are in HD, so Navionics was my choice this year. If you choose Navionics, then get the NavPlanner instead of MapCreate.

Jim
 

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Discussion Starter · #9 ·
Britt, the HD maps are being added each year. Each one represents a real survey using sonar rather than the usual maps based on paper maps, like USGS maps from years ago. Those were accurate, especially useful for places since converted to impoundments. But none could possibly account for siltation and channelization.

A 16 foot error in position is within standard. It's acceptable. Aggravating, but OK. In fact that's a really nice error. Anything that interferes with a satellite signal reaching your antenna module is already anticipated. A sunspot, or some stratospheric activity, a row of docks reflecting signals, a houseboat or airplane radar, or less than desirable antenna location on your boat can cause errors.

Jim
 
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