This question is probably dumb but I have tried on another forum and nobody have the answer. I also searched a lot before on the web and I can't find the info...

If we check on a chart like that :
http://cdn.stripersonline.com/b/be/1...ionicsgold.png
(I have a Navionics and there is no legend)

The big number or the single number is the depth in feet (or meters depending the setting option on the gps) but what the little number means after the big number (when there is one) ?

This might be your answer: http://www.thebassbarn.com/forum/7-d...rtplotter.html

Tenths readings: 16.4, for example. Instead of a decimal, they shrink the number, so you wont mistake it for 164 ft.

Sounds good haha ! Thanks for the info