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Old 09-20-2010, 01:11 PM   #1
fltsimguy
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Default Underwater Topography

Aside from the depth contours on Bizer maps, has anyone ever seen a map of the underwater topography of the Lake? I've always wondered what it looks like down there.

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Old 09-20-2010, 02:12 PM   #2
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I have always wondered the same thing! I would love to see a map showing the bottom of the lake, minus the water....
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Old 09-20-2010, 03:00 PM   #3
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other than Bizer, the last two versions of the Navionics chips provide very detained mapping of the bottom. The lastest version is accurate to like 5 ft. This chip will run in any Navionics compatible GPS.
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Old 09-20-2010, 03:46 PM   #4
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Smile Navionics Map

This sample of my Navionics map seems to be a bit more detailed for underwater topography.

I did a little investigating when I spotted that they named some of the under water mountains in the lake. The person I contacted at Navionics was sure that USGS was the one to name these features. This is the response that USGS sent back:

Underwater features generally are not shown on USGS topographic maps. I took a look at the USGS Geographic Names Information System (GNIS) database at U.S. Board on Geographic Names and found no features by those names listed in New Hampshire.

I am forwarding your inquiry to the GNIS Manager, for further response.
(I have not pursued the issue any further.)
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Old 09-20-2010, 04:50 PM   #5
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That's a pretty cool graphic! The one area of the lake I was particularly interested in was The Broads. I've always been curious why the depth goes from 180'+ to 30' so quickly. Thanks for sharing!
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Old 09-20-2010, 07:18 PM   #6
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I have a pretty good feeling that Bizer knows where those names came from.
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Old 09-21-2010, 11:11 PM   #7
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The map that RG scanned above is available at


Gilford
FAY'S MARINE STORE
3 Varney Point Road
Gilford, NH 03249 UNITED STATES
Phone: 603-293-0808
Fax: 603-293-0022
Email: dave@faysboatyard.com

SILVER SANDS MARINA
Rte 11B, 103 Weirs Road
Gilford, NH 03249 UNITED STATES
Phone: (603) 293-2115
Fax: (603) 293-2086
Email: jg@silversands.com
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Old 09-22-2010, 11:39 AM   #8
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Default Winter harbor

RG great map. Is there a set of the lake? I'm interested in the enterance to Winter Harbor. Everytime I drive thru there my depth finder goes crazy.
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Old 09-22-2010, 12:30 PM   #9
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Smile Navionics Map

FLboater, my attachment is actually part of a folded, vinyl-ish, whole lake map. I chose that area because I was interested about where the underwater mountain names came from. From the above e-mail that I received from USGS, I suspect the name are not official.

This map is quite interesting for studying and I look at if often. I'm glad R-Guy snapped it up when he saw it at County Stores hardware in Milford. I hope the local retailers that are listed above have a lot of copies! Thanks Rattlesnake Guy.

When I get back to the camp, I can get a better scan of the entrance to Winter Harbor and send it along to you.
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Old 09-22-2010, 01:53 PM   #10
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Talking Mt Celia?

Cool map RG, gotta get me one. This map got me looking at the depth recordings on my Bizer. I found an area that I travel frequently that I never thought about being shallow. Half way between Jolly and Sandy in the Broads it gets down to 12 ft! Can I name it, huh, huh, can I, can I?
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Old 09-23-2010, 09:13 AM   #11
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Flboater, I'm curious too. I've noticed that during a NW wind the swells build up at the entrance of Winter harbor....even bigger than the broads.
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Old 09-27-2010, 12:24 PM   #12
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Default Got The Map

I bought the map yesterday at Fayes. I think the Winter Harbor Entrance thing is related to how you cut the entrance. The 2 side points sand bars are larger than I thought.

Great map.
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Old 09-27-2010, 01:13 PM   #13
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Default Bathymetric map from Navionics

Neither Fays not Silver Sands has the bathymetric chart posted here. They are made by Navionics but marketed by MapTech (508-990-9020).

Price is $14.95 and they have a limited number in stock; Re-print set for about Feb. 2011. At some point they will contact Winni marinas and stores etc. and get them out that way also.
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Old 09-27-2010, 05:03 PM   #14
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The Map I bought at Fays is a navionics hotmapes premium.Lake Winnipesaukee
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