How do I draw routes on a photo on my computer?

What is the best way to accurately draw dotted lines to represent routes on photos on my computer? 

Stylus pen/light pen?

Adobe Illustrator?

?

Sharpie!

Mountain project lets you add topo data when you upload a picture. If you are trying to make it for private use, a stylus and the Microsoft paint works well for sharing a pdf with a couple buddies.

you need to do it in good style, bottom up...none of that top down shit.

pixel by pixel...

this is the purest style

I use Gimp. Free photoshop, basically 

Photopea.com works well for me. 

As you can see from at least 4 responses, any photo/image editor. Or the Sharpie approach (print photo, draw lines, photograph photo, upload, profit!) Well, maybe not that last point.

I copy and paste (using the snipping tool) into an Excell spreadsheet. In Excell there's a wide range of line types and features (also shapes and symbols) to choose from. Excell allows you to easily move portions of lines after drawing them, so it's not a one shot attempt. Word and PowerPoint have the same capability but their "canvas" size is set which can be annoying in some situations.