Yes, ik its old, but gold.
Step 1: Edit iw3mp.exe with NotePad++
Step 2: Find sv_cheats (CTRL+F), replace v to j. Like this sj_cheats. Save.
Step 3: Find g_compassshowenemies, replace g to j. Like this j_compassshowenemies. Save.
Step 4: Join to game and type in console /devmap mp_crash
Step 5: Type in console /sj_cheats 1. U can leave devmap.
Step 6: Join to any server and type /j_compassshowenemies 1
But careful, it can be caught on getss command. So you can bind it for safe.
Example: /bind z "j_compassshowenemies 1 /bind k "j_compassshowenemies 0. So u can use it fast.