B&G Zeus 3s Memory Cards

I recently installed a Zeus™ 3S 9 chartplotter on my sailboat, and am generally happy with it. I’ve been running into a few problems and am still trying to figure out what’s going on. This is probably only the first post that I’ll write about issues I’m having.

The manual says it can read memory cards larger than 32GB if they are formatted NTFS. I found the smallest flash card in my regular collection of cards was a 32GB card. I put it into the chart plotter because I wanted to copy the screen captures to my computer, but it was not recognized.

Today I found a 16GB card that had been used in a raspberry pi project and reformatted it in windows 10, then took both it and the larger card to the boat.

I did a couple of tests and the 16GB card was readable from either slot, while the 32GB card doesn’t show up.

You can see that I put the 32 GB card in the top slot and the 16 GB card in the bottom.

Micro SD Cards Fully Inserted

The second picture shows the memory cards fully inserted. At that point I was able to see the 16GB card in the chartplotter, but the 32GB card does not appear.

Chart Plotter Screenshot

After I returned home I looked at the filesystem properties on each of the cards.

The larger of the two cards had defaulted to the exFAT format, while the smaller was FAT32. I was able to reformat the larger drive as FAT32 and may test if it can be read by the chartplotter in the future. I don’t like buying small memory cards. I have found the fast (Ultra High Speed Class 3 = 30 MBit/second) 128GB cards are the right ones to buy for my drone and camera usage.

As I read through this post you can see that the 16GB card is listed as UHS-3 while the 32GB card is UHS-1. I don’t think that should make a difference in this usage.