Please add support for Maidenhead locator system
Maidenhead Locator System (http://en.wikipedia.org/wiki/Maidenhead_Locator_System) is widely used by Amateur Radio operators. Many GPS devices have at least basic support for it (e.g. Garmin). The basic is to show/handle the locator like other coordinates system (e.g. GPS coordinates). More advanced support can include visualisation of the locator squares on the map (sometimes it's handy for AR operators to know where are located borders of the locator square).
Maybe also Amateur Radio addon would be great option. The functions mostly needed by AR operators includes: observation of locator of the current position, observation of locator of any position, finding position on the map by entering the locator, finding bearing and direct line of sight distance between two locators, showing terrain (altitude) profile between two locators (direct line of sight).