I have not been to Karachi in 20 years but I can give you some sites that you may add to to Karachi locations:

1. Empress Market
24'51'44',96" N 67'01'46'46" E

2. Karachi University
24'56'28'82 N 67'07'21'54" E

3. Karachi Airport
24'34'01'16 N 67'10'05'16" E

4. Mereweather Tower
24'50'56'20' N 66'59'50'70" E

5. Pakistan Steel Mills
24'48'03'75" N 67'20'27'28" E

6. Port Qasim
24'46'17'68' N 67'20'04'00" E

7. Karachi Golf Club
24'53'20'20' N 67'06'15'28" E

8. St. Joseph's School
25'51'40.30" N 67'02'06.08" E

9. St. Patrick's School
24'51'47'.23" N 67.02.04.77" E

10. St. Paul's School
24'51'37.29" N 67'02'12.02" E

11. Nazimabad Eidgah Ground
24'54'41'35' N 67'01'47'81" E

12. Hussaini School
24'54'45'07 N 67'01'45'34 E

13. Gol Market Nazimabad
24'54'52'24 N 67'01'27'42 E

14. Aisha Bawani School
24'51'24'37 N 67'02'48'62 E

15. Gora Qabrustan (British Cemetry)
24'51'27'34' N 67'02'59'72 E

16. Nazimabad Government School
24'54'34'08 N 67'01'55'94 E

17. Hadi Market
24'54'54'62 N 67'01'57'99 E

18. Ghalib Library
24'54'36'39 N 67'01'54'93" E

Thanks
Farhan Siddiqui