i did, but..... here is gmaptool `s output. (Basemap can read this img file in garmin folder).
Program start.

====================================================================

Input file: MYFOLDER/gmapsupp.img.
Reading file MYFOLDER/gmapsupp.img.
Split map MYFOLDER/gmapsupp.img.
Write map 00002309 -> 2309_mdr.img, file 25972736, header 5000h, block 4096
Write data I0000905 -> I0000905.TYP, len. 42364
Write map I050E5D5 -> 05301717.img, file 4120576, header 2000h, block 8192
Write map I050E5D6 -> 05301718.img, file 4923392, header 2000h, block 8192
Write map I050E5D7 -> 05301719.img, file 7323648, header 2000h, block 8192
Write map I050E5D8 -> 05301720.img, file 39424, header 1400h, block 512
Write map I050E5DA -> 05301722.img, file 3870720, header 2000h, block 4096
Write map I050E5DB -> 05301723.img, file 6008832, header 2000h, block 4096
Write map I050E5DC -> 05301724.img, file 26427392, header 4000h, block 16384
Write map I050E5DD -> 05301725.img, file 11329536, header 2000h, block 8192
Write map I050E5DE -> 05301726.img, file 16457728, header 4000h, block 8192
Write map I050E5DF -> 05301727.img, file 10272768, header 2000h, block 8192
Write map I050E5E0 -> 05301728.img, file 132096, header 1400h, block 1024
Write map I050E5E1 -> 05301729.img, file 20066304, header 4000h, block 4096
Write map I050E5E2 -> 05301730.img, file 12910592, header 2000h, block 8192
Write map I050E5F5 -> 05301749.img, file 26034176, header 4000h, block 16384
Write data D097022A -> D097022A.MD2, len. 490559
Write map ONLY13BI -> 05302093.img, file 14336, header 1400h, block 1024
Write unl gmaptool00.unl, codes 2
Write file mapset.mp
Write file mapset.tdb
Write file mapset.mdx
Running compiler for preview map compilation.
""MYFOLDER/2/cgpsmapper.exe" -l "MYFOLDER/2/mapset.mp""

*******************************************************************************
cGPSmapper a GIS converter into GARMIN compatible format maps
Version : 0100d Nov 19 2010
Copyright(C) Stanislaw Kozicki, 2000-2010
[Only registered and activated users can see links. ]

THIS IS A FREE / SHAREWARE / PERSONAL VERSION OF CGPSMAPPER - YOU CAN USE
IT ONLY IF YOU AGREE WITH CGPSMAPPER NON COMMERCIAL LICENCE TERMS OF USE
BE SURE TO READ LICENCE.TXT FILE WHICH COMES TOGETHER WITH CGPSMAPPER
OR GO TO [Only registered and activated users can see links. ]
*******************************************************************************
Non Commercial only - Free cGPSmapper version with extended set of types
*******************************************************************************
Custom type definition : YES
ESRI data support : NO
POI full info : NO
POI indexing : NO
City indexing : NO
Find intersection support : NO
Street numbers support : NO
Street full address : NO
Global indexing support : NO
Auto-routing support : NO
Marine (extended) types : YES
Map locking support : NO
*******************************************************************************
Garmin and MapSource are registered trademark or trademarks of
Garmin Ltd. or one of its subsidiaries.
*******************************************************************************
cGPSMapper home page: [Only registered and activated users can see links. ]
*******************************************************************************
Importing and preprocessing data
Current import datum is: W84 :WGS 84 Global Definition II

MYFOLDER/2/mapset.mp(34) : Warning W008: Element spans more than 10 degrees!

MYFOLDER/2/mapset.mp(40) : Warning W008: Element spans more than 10 degrees!

MYFOLDER/2/mapset.mp(64) : Warning W008: Element spans more than 10 degrees!

MYFOLDER/2/mapset.mp(76) : Warning W008: Element spans more than 10 degrees!

MYFOLDER/2/mapset.mp(82) : Warning W008: Element spans more than 10 degrees!

MYFOLDER/2/mapset.mp(106) : Warning W008: Element spans more than 10 degrees!

MYFOLDER/2/mapset.mp(111) : Warning W008: Element spans more than 10 degrees!

MYFOLDER/2/mapset.mp(116) : Warning W008: Element spans more than 10 degrees!

MYFOLDER/2/mapset.mp(128) : Warning W008: Element spans more than 10 degrees!

MYFOLDER/2/mapset.mp(132) : Warning W019: More than ONE background objects defined - switching to full manual background creation mode.

MYFOLDER/2/mapset.mp(133) : Warning W008: Element spans more than 10 degrees!

MYFOLDER/2/mapset.mp(138) : Warning W008: Element spans more than 10 degrees!
Codepage set to: 1252
String coding: 6 bits
POI info sorting
Layer >>>>>>0<<<<<< generation
Elements to process -->1
Processed -->1
Successfully imported: 1 not imported: 0
Elements to process -->20
Processed -->17
Filtered -->3
Successfully imported: 17 not imported: 0
Maximum error: 1.20476 meter
Mean error: 0.0669308 meter
Elements to process -->20
Only background
Processed -->3
Filtered -->17
Successfully imported: 3 not imported: 0
3 regions to import... done

Size optimization in progress
Biggest internal file: 580
Detected : Storage GPS
Available memory : 2 GB
Max number of maps: 99999
Final map size : 5 kB
Maps uploaded!
MYFOLDER/2/mapset.img is created.
Done!
File :MYFOLDER/2/mapset.img is ready to use
Execution time: 0.09 s