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Author Topic: How much info on a 24MB memory  (Read 1837 times)

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Offline banjoman

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How much info on a 24MB memory
« on: January 12, 2008, 06:54:28 AM »
How much map data can be stored on the internal 24 MB memory of a Garmin Venture HC or Summit HC.  I live in Maine can I get the whole state on there with Topo 2008? Or should I just spring for the Legend with the SD card slot?
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Offline Siskiyou

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Re: How much info on a 24MB memory
« Reply #1 on: January 12, 2008, 10:52:33 AM »
The map segments in Topo 2008 average .6 MB.  Because of the large undeveloped areas in Maine I suspect the map segments are smaller and MIGHT get the full state in 24 MB.  You can buy the eTrex Legend HCx for approximately $209.00 on the net.  You can buy a 2GB micro sd card for around $16 or a 1 GB card for less.   The big plus for the eTrex Legend HCX are the 25 hours of battery life, the ability to use the micro sd card, 10 addition track logs, 500 additonal waypoints, custom POI(create you own points of interest), and autorouting.  The base map in the Legend HCx is upgraded over the map in the other two.





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Offline Siskiyou

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Re: How much info on a 24MB memory
« Reply #2 on: January 12, 2008, 11:59:23 AM »
Rainman/GA if I understand correctly you are using a copy of US Topo 2008.  Would you mind running the Map Tool over the State of Maine and determined how many Maps there are how much space they use?  The information will be help a member.
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Offline Rainman/GA

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Re: How much info on a 24MB memory
« Reply #3 on: January 15, 2008, 04:08:03 AM »
Quote from: Siskiyou on January 12, 2008, 11:59:23 AM
Rainman/GA if I understand correctly you are using a copy of US Topo 2008.  Would you mind running the Map Tool over the State of Maine and determined how many Maps there are how much space they use?  The information will be help a member.

I'll take a look when I get home tonight.  I know I put a large portion of the Maine topos in my 76Csx last fall when I was on a business trip up there.
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Offline Rainman/GA

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Re: How much info on a 24MB memory
« Reply #4 on: January 15, 2008, 05:01:20 PM »
Quote from: banjoman on January 12, 2008, 06:54:28 AM
How much map data can be stored on the internal 24 MB memory of a Garmin Venture HC or Summit HC.  I live in Maine can I get the whole state on there with Topo 2008? Or should I just spring for the Legend with the SD card slot?

I just checked and including all of the state boundaries and coastlines, TOPO 2008 covers Maine in 72 maps, 35.4 MB.  So you could store most of the state's Topos in the 24 MB of memory.  However, there will be no room left for any highway maps (which I find useful).

What is interesting is that the older TOPO USA covers the entire state in 75 maps and only 15.3 MB. So if you could find an older copy of Topo, you can save a bit of room.  The contours aren't quite as smooth, nor as detailed as those in TOPO 2008, but you get a bit more coastal data, such as bathymetric info, shipwrecks, channel markers, etc. However, these water features don't appear to have nearly as much data as those on the Gulf Coast/Florida panhandle.

One thing I never noticed until now is that the new TOPO 2008 has a lot more roads, complete with street/road names.  I see now that I should be able to load topo quads from both the old & new software simultaneously onto my GPS, so I can directly compare the map overlays.
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Offline Siskiyou

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Re: How much info on a 24MB memory
« Reply #5 on: January 16, 2008, 06:57:59 AM »
Rainman/GA;

Thanks for the research and results.  I was aware that the new maps contained some new data which is nice.  I felt with the changes 2008 would eat up  more memory.  In this case more then twice the memory was used because of the additional data.

One item that I make a fair amount of use of is the POI(Points of Interest).  The reason is that a greater of the area I hunt has been impacted by the California Gold Rush and other mining activity.  The old placer mines do not cause me much concern, but the hard rock mines do.  A vent hole in an old mine, or a shaft can be a death trap.  Having had an old hole covered with rotten boards, and pine needles give way under me was an attention getter.

Would you mind comparing the POI for the same location between the two softwares?

Thank-you
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Offline Rainman/GA

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Re: How much info on a 24MB memory
« Reply #6 on: January 16, 2008, 07:18:04 AM »
Quote from: Siskiyou on January 16, 2008, 06:57:59 AM

Would you mind comparing the POI for the same location between the two softwares?


What state and area?  I can make some screenshots of each and perhaps put them in a followup message tonight (assuming our power doesn't go out because of the potential ice storm we're facing!).    ::)
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Offline Siskiyou

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Re: How much info on a 24MB memory
« Reply #7 on: January 16, 2008, 08:07:36 AM »
LoneJackMine,   N40 50.743 W123 07.468 located in N. California.  When I search for mines I find seventeen within 10.8 miles of the Lone Jack Mine using Map Source US Topo West disk.  I am sure this does not show every hole but it is an indicator to watch-out.
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There is a learning process to effectively using a gps.  Do not throw your compass and map away!

Boycott: San Francisco, L.A., Oakland, and City of Sacramento, CA.

Offline Rainman/GA

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Re: How much info on a 24MB memory
« Reply #8 on: January 27, 2008, 10:34:27 AM »
Quote from: Siskiyou on January 16, 2008, 08:07:36 AM
LoneJackMine,   N40 50.743 W123 07.468 located in N. California.  When I search for mines I find seventeen within 10.8 miles of the Lone Jack Mine using Map Source US Topo West disk.  I am sure this does not show every hole but it is an indicator to watch-out.

Sorry for the delay, but here are a couple of screenshots from the 2 topo software packages.  I wasn't sure how to search for mines within a certain radius, so I'm posting screenshots of your Lone Jack Mine area with the detail set to maximum on both and shading turned on for Topo 2008.  You can turn shading off if the map is too cluttered.

The first is from Topo West:

And the second is the same area in Topo 2008:

Just for grins, I zoomed in closer on the mine and did a right click on the waypoint, which shows the mine name (3rd screenshot).  Also shows roads going to/from the mine.

BTW, I noticed that the 2008 package will show more detail as you zoom in.  Both of these shots were with a 1.5 mi zoom level.

Hope this helps!
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Offline Siskiyou

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Re: How much info on a 24MB memory
« Reply #9 on: January 27, 2008, 01:13:34 PM »
Good screen shots.  I assure you that I will be studying them.  This is how I searched for mines using US Topo.

Created LONE Jack Mine Waypoint.

Selected FIND in the Tool Bar.

Selected Find Nearest Places>Place Category>Geographic Places>Place Subcategory>Containing>type in mine

The drop down will give you the name of the mines, degrees and mileage.  In addition you can select a mine by clicking on it, select Make a Waypoint, and select a symbol for the new waypoint.

As a side note I mentioned earlier the importance of being aware of the hazards in mining country.  Last week in the California Mother Lode a guy was out walking with his dog on a trail next to a canal that dates back to the mining days.  The dog went off the trail and fell into an airshaft.  Understand the airshaft had been covered with chicken wire, and then normal forest litter had fallen on it.  Fire rescuers were able to get the dog out.  Understand the shaft was about 30-feet deep, and 3 or 4 feet across.

http://www.auburnjournal.com/articles/2008/01/22/news/top_stories/03dogrescue22.txt


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There is a learning process to effectively using a gps.  Do not throw your compass and map away!

Boycott: San Francisco, L.A., Oakland, and City of Sacramento, CA.

Offline Rainman/GA

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Re: How much info on a 24MB memory
« Reply #10 on: January 27, 2008, 03:10:42 PM »
Quote from: Siskiyou on January 27, 2008, 01:13:34 PM

The drop down will give you the name of the mines, degrees and mileage.  In addition you can select a mine by clicking on it, select Make a Waypoint, and select a symbol for the new waypoint.


OK, here's a partial list from each dataset.

I gotta tell you, I'm liking this new Topo 2008 more and more.  The 3-D shading (on the PC) gives a lot of visual information all by itself.
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