I've made it for you :
see, now the minimap have solid black color, with white grids
note : if you press "M" the grid disappear
and the map become partially transparent again, but not blue and it transparency not like original minimap
just for comparison :
old minimap transparency = 50%
new minimap transparency = 80%
*higher percentage mean close to solid color
Download link
https://docs.google.com/file/d/0B-MO5b8Eri2ORnA3ci1nN3k3V1k/edit?usp=sharing
*note : I use Google drive to upload, maybe you need to login to google if you want to download this .
HOW TO INSTALL SPR FILE:
AFTER YOU DOWNLOAD THE SPR,
COPY THAT ".SPR" FILE TO :
C:\Program Files\SD EnterNET\NavyFIELD\SPR
PRESS OK IF IT NEED TO REPLACE OLD FILE
MAKE SURE YOU BACKUP OLD FILE THAT YOU WANT TO REPLACE TO ANOTHER FOLDER
IF YOU DON'T LIKE IT, PLEASE WRITE WHAT YOU NEED, MAYBE I CAN HELP TO EDIT IT AGAIN.
Thanks.