Nice :-)
I would maintain the high contrast of the original if possible.
As for numerals, try to do them, they could be handy, especially in maps! ;-)

numerals would add a lot to the whole typeface. Presentations could included geographic coordinates (43°0′36″N 83°41′24″W)
The current letters look great!

Thanks for the feedback, guys, I'll take a stab at those numerals.

Great stuff. Keep the quirkiness, but maybe even out the colour — S and T particularly look different weights here.

Though I understand what you're thinking, slashes usually have the same weight both ways.

Definitely do numerals if you can.

In a similar vein: Tierra Nueva

Presentations could included geographic coordinates

Or altitudes (and the numbers used to identify squares on the grid).

(also, on typefaces from old maps: http://www.mvbfonts.com/mvb_sirenne/design_info)

Oh! thanks for the advice on slashes, Bendy, you can tell I'm new at this :) Regarding the S and T, I don't really like the S either, although it's exact as far as the reference map is concerned; I'll be trying to rework that one. I think the T's major problem might be the fact that it's next to the wonky S, but I'll take a second look at that one as well.

Thanks for the link, Riccard0! If I had found that before I started the project, I may just have bought it and been done, lol. Now that I've gone through all this, though, I find myself thinking I like mine better. Of course, I'm totally biased ;)

Carta Marina is another similar idea.