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Messages - Boyd

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Happy to help. Remember, you need to include any maps installed in the GPS internal memory in the count. So your 2000 segment card actually might be at the limit.

Probably not, but do some quick research on your own and see how many map tiles you currently have on a card and how much storage is being used. There's an old thread here where somebody bought hundreds of dollars of the Garmin 24k topos back when they were selling them on DVD's. Then he was upset they wouldn't work when he copied them all to a big SD card.

But you could also download Birdseye imagery and put it on the card, that can get into a lot of gigabytes and is not part of the tile limit.

I think you've got it down pretty well. I would use a built-in SD card reader unless your computer is really old with slow ports. In almost all cases, it will be faster and less prone to error if you create the card in the computer, then put it in the GPS.

I'd suggest installing these two free tools, they are really helpful for managing Garmin Devices. Unfortunately, the author had a serious health problem several years ago and is no longer updating these apps, so there could be compatibility issues with newer operating systems (especially on the Mac).


There's a less-obvious but important thing to check on your cards. Use the Device Manager program to check the total number of map segments on each card. See this info from Garmin's site, which says your GPS supports a total of 3000 segments.


Do not create a card with more than 3000 segments or it won't work properly. Some maps or parts of maps will be blank if you exceed the limit. Impossible to predict because it depends on the maps you are installing.

But the segment limit applies to ALL files on the GPS - the SD card PLUS internal memory. So you need to add those two numbers and make sure it is less than 3000. There's no standard size for a segment, it's up to the map maker.

Typically, you will hit this invisible segment limit long before you fill an 8gb SD card.

Map Making Support / Re: Experiments with LIDAR
« on: June 07, 2022, 10:45:24 AM »
Have gone back to the beginning of this thread and started playing with grayscale imagery again, to see if I can create more detailed maps.

Believe it or not, ten years have passed, I'm still here and still doing "Experiments with LIDAR"!  ;D Still working with grayscale imagery too, but with 1-meter resolution DEM in 3d with my own web app. Garmin devices and software just can't support the maps I want to make anymore.


My web app is free, there's no advertising, no registration and it works on any device.

This has been my most ambitious map-making project yet, ten million map tiles (over 260gb), covering a portion of the US Mid-Atlantic region. Am planning to expand the map to a much larger area later this summer. This is the current coverage

There's also a 2d version of the map which loads faster and uses less data, since there's no 3d elevation data.


Still using Globalmapper for almost everything, finally upgraded to version 23 this year. My app uses the open source Maptalks API however the 3d maps use Mapbox GL/JS inside a Maptalks container. Has been quite an education, needed to figure most things out for myself as there is not much documentation on building 3d maps from your own data and hosting them yourself.

I put all the DEM together in 32-bit floating point TIFF files which are imported into the Mapbox rasterio command-line program, then exported in Mapbox RGB elevation format. I wrote my own code to read elevation from these files and show it in a realtime "heads up" display on the map.

As a companion project, I used NASA ASTER 1 arc-second DEM to make a lower-resolution 3d map covering all of North America. Used USGS National Landcover Dataset and ESA Worldcover data (outside the US) with my own pseudo natural color pallete to produce a more "artistic" 3d view, along with atmospheric effects.


This was more of an "art project" for fun, but the elevation data is used in the same way as the other map, providing a realtime elevation display anywhere in North America as you move the map around. Still a big project, but "only" about 4 million tiles / 100gb.

There are over 200 other maps available in my app, from servers in many different US states, Canada and even Switzerland. Also OpenTopo, USGS National Map, live weather forecasts and radar plus a number of maps from HERE (the company that provides data to Garmin for City Navigator). I support waypoint import/export in Garmin-compatible GPX files, plus my own format that can be customized and imported/exported in Excel. Not supporting tracks yet, but will get around to it eventually.

Anyway... that's what I've been up to. How did you spend the last ten years?  ;D  Is anybody from this thread still here? Quite a nostalgia trip revisiting it now, I do miss the old days.

Map Making Support / Re: What is the CGPS Mapper?
« on: May 16, 2022, 05:15:53 PM »
You really should not need to use MapsetToolkit. It's a program for people who make maps. Almost all the maps here include an installer, just double-click the installer and the map should be installed in Basecamp automatically.

Also note that Garmin .img files are NOT "disk images". Garmin uses the .img extension for their own purposes but that same extension is also used for disk images. But the two are completely different things. Windows may claim they are "disk images", but that is bogus.

You don't say which map you are trying to install, but look at its download page. For example:


Notice the "installer" icon. That means you simply need to run the installer. See this tutorial:


Using The Maps/Garmin Software / Re: Cannot unlock maps
« on: May 08, 2022, 11:25:29 AM »
Cool.  8) MyTrails is a free map available on this site. It's just an overlay that must be enabled at the same time as another map.

How many maps are on the card? There's a limit to the number of "segments" that Garmin devices can access - these are the small "tiles" that make up the full map. This limit is reached long before you run out of space on a SD card. Impossible to be specific because it depends on the exact maps and GPS, but my experience has been that you will likely hit the limit with 4gb or less of map files. If you go over this limit, strange things may happen on the GPS. This is something Garmin really has not documented very well.

A limit of 4000 map segments is typical, with old devices only allowing about 2000 and a few new premium (ie: expensive) models supporting something like 10,000 segments.

Using The Maps/Garmin Software / Re: Cannot unlock maps
« on: May 08, 2022, 09:34:44 AM »
The free maps on this site do not require "unlocking". There are, however, some maps that are listed here but you must go to another site to actually download. Some of them could be locked. If so, that would likely mean they could only be used on the first device on which they were installed, or only from the original memory card the map was provided on.

So... "it depends" on exactly what maps you're talking about. All of Garmin's own recent maps are locked in the same fashion. So perhaps the problem maps are actually commerical products from Garmin or a third party that have this kind of copy protection? For example, if you had a Garmin 24k topo on your old GPS and moved it to the new one, you'd get this sort of error message.

OTOH, it could also just be a bug in Garmin's software... it wouldn't be the first time for that.  ;D

Map Making Support / Re: Base Map Source?
« on: May 04, 2022, 03:29:15 AM »
Right. You can go to the National Map, zoom in on your area of interest and choose the type of data you want. If you are interested in a specific US state, next to "area of interest", choose "selectable polygon" from the dropdown, then choose "US State of Territory" from the other dropdown. Now you can click the state you want and limit your search to it.


Map Making Support / Re: Base Map Source?
« on: May 03, 2022, 07:20:42 AM »
Individual states may have their own data available. But you could also use data from OpenStreetMap shapefiles:


Cool - glad I was able to help!  8)

General Discussion / Re: Garmin Inreach Explorer
« on: April 24, 2022, 08:10:50 AM »
Have you seen this?

Pre-loaded data
When purchased in North America, the Explorer+ is preloaded with the following maps:

Topo 24K for the US and Canada (Made by DeLorme)
Topo 125K for Mexico (Made by DeLorme)
World Wide BaseMap (Made by DeLorme)
These maps have not been updated since the 2017 product release, and they will not be updated by Garmin.

Downloadable data
The Earthmate has 2 GB of internal storage for additional data.

The following maps can be added to the device:
 OpenStreetMaps, which covers the world and offers road detail, and light topographic detail. Sometimes they include trails. These maps are just like Garmin?s Cycling maps, and receive updates.


Assuming they use DeLorme's vector-format, that is an option under Export > Vector in GlobalMapper, although I have never used it. From the GlobalMapper help file:

DeLorme Text File
The Export DeLorme Text File command allows the user to export any loaded vector features to one of 3 text formats that can be loaded into select DeLorme mapping products.

When selected, the command displays the DeLorme Text Polygon Export Options dialog which consists of an Export Bounds panel that allows the user to set up the portion of the loaded vector data they wish to export.

General Discussion / Re: bumping offending post off the front page
« on: March 28, 2022, 04:17:25 AM »
I reported a spam post that was filled with porn when I first saw it a few days ago.

I wonder if it's an issue with the amount of power that the USB port provides? IIRC, there have been general USB issues related to that with some of the M1 Macs. You might try using a powered USB hub and see if that makes a difference.

GPSr Units / Re: Garmin tread
« on: March 19, 2022, 05:22:06 AM »
Would be surprised if anyone here has a Tread. Garmin's specs say you can add maps, so just give it a try.

Also, you should understand that "your maps" is pretty meaningless here. The maps on this site are made by many different people and can vary greatly in terms of quality and usefulness. There is no approval process or standards for the maps here, anybody can upload whatever they like.

Site Support / Re: trouble trying to install maps to base camp
« on: March 08, 2022, 04:33:08 PM »
You will need to provide a lot more info for anyone to help.

1. Link to the map, or at least a clue as to where to find it
2. What are the "issues"? What did you do and what happened?
2. Computer/operating system (such as Windows 10, MacOS Catalina, etc)

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