https://play.google.com/store/apps/details?id=cz.jerabekjakub.locusaddon.offlinegooglemaps (https://play.google.com/store/apps/details?id=cz.jerabekjakub.locusaddon.offlinegooglemaps)
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This addon for LOCUS allows you to download static Google satellite maps for each geocache.
You can choose image resolution, format and zoom level downloaded maps. Maps can be find in tab "Images" in Locus.
Since new Locus 3.0.0 you can automatically save images for offline browsing:
1.) Android 3.0 or higher is required
2.) Edit Locus config file (Locus/config.cfg) - at the bottom is option 'dev_enable_auto_gc_offlinizer', set it to 1 (true)