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I posted a python script to use from ArcGIS here:

Exporting 3GB ArcGIS Raster to KML without losing resolution?Exporting 3GB ArcGIS Raster to KML without losing resolution?

The different models support different numbers of tiles. You have to look at this limitation, the extent of imagery you want to use, and the minimum resolution you want to use. Then you need to possibly create multiple files from your original imagery, process each section of imagery with the script tool, and transfer the files from a laptop to the GPS as you need them (Garmin only support 1 "Custom Map" at a time). Many of the *map models only support 100 1024x1024 tiles. The Colorado and Montana support more. I experimented with changing the tile size to 2048 x 2048 and that seemed to still work and allow for quite a bit more data at a time.

I posted a python script to use from ArcGIS here:

Exporting 3GB ArcGIS Raster to KML without losing resolution?

The different models support different numbers of tiles. You have to look at this limitation, the extent of imagery you want to use, and the minimum resolution you want to use. Then you need to possibly create multiple files from your original imagery, process each section of imagery with the script tool, and transfer the files from a laptop to the GPS as you need them (Garmin only support 1 "Custom Map" at a time). Many of the *map models only support 100 1024x1024 tiles. The Colorado and Montana support more. I experimented with changing the tile size to 2048 x 2048 and that seemed to still work and allow for quite a bit more data at a time.

I posted a python script to use from ArcGIS here:

Exporting 3GB ArcGIS Raster to KML without losing resolution?

The different models support different numbers of tiles. You have to look at this limitation, the extent of imagery you want to use, and the minimum resolution you want to use. Then you need to possibly create multiple files from your original imagery, process each section of imagery with the script tool, and transfer the files from a laptop to the GPS as you need them (Garmin only support 1 "Custom Map" at a time). Many of the *map models only support 100 1024x1024 tiles. The Colorado and Montana support more. I experimented with changing the tile size to 2048 x 2048 and that seemed to still work and allow for quite a bit more data at a time.

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Mike
Mike
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I posted a python script to use from ArcGIS here:

Exporting 3GB ArcGIS Raster to KML without losing resolution?

The different models support different numbers of tiles. You have to look at this limitation, the extent of imagery you want to use, and the minimum resolution you want to use. Then you need to possibly create multiple files from your original imagery, process each section of imagery with the script tool, and transfer the files from a laptop to the GPS as you need them (Garmin only support 1 "Custom Map" at a time). Many of the *map models only support 100 1024x1024 tiles. The Colorado and Montana support more. I experimented with changing the tile size to 2048 x 2048 and that seemed to still work and allow for quite a bit more data at a time.