What are these mods?

[Siberian]

I'm new to SH4 and I'm loving it so far. Been using the bearing plotter and finding it useful. But in different videoes I've seen something else - also used on the map screen. It's a scale of some sort placed on the right side of the screen. It shows speed, distance, and what I think says minutes as separate vertical lines for some conversion use. What is this mod and how is it useful?

Also I've seen som new map tools like another pencil and stuff.

Third, I find it a bit difficult to see if the buttons down to the left are on or off - such as seeing if the periscope is up or down. Is there something to make this more clear?

I appreciate any kind of response