This certainly isn't a new issue but I thought I would highlight it as Geo-sitemap Generator is still listing the old information.

For just under a year, GWT (Google Webmaster Tools) doesn't support "uploading you Geo Sitemap"

Geo Sitemaps (KML Files) In Google Webmaster Tools Returning Invalid XML Tag Error

However, throughout the process on Geositemap generator, they still recommend uploading through GWT.

Geo sitemap generator | Create Geo Sitemap and KML files for FREE!

Anyway, this has been the case for a while but just thought it was worth mentioning as they (Geositemap Generator) still recommend uploading to GWT, even though it's not supported.