FloodWatch is a prototype application that provides location-based alerts of flooding on Pebble Smartwatches. Building on the open source flood map PetaJakarta.org, FloodWatch aims to provide residents of Jakarta, Indonesia with time critical alerts of monsoon flooding via their wearable devices. PetaJakarta.org is a real-time flood map which integrates emergency services information, social media, citizen journalism and sensor data to provide real-time situational awareness for both residents and government agencies in Jakarta. Existing disaster maps and mobile alerts require the user to interact with their smartphone device to consume and interpret reports. Alternatively, connecting real-time disaster data to wearable devices for the provision of actionable intelligence "at a glance" reduces disruption to user activity, improving time to response. Furthermore, through the use of predefined locational filters the user is able to register for alerts for specific regions of the city providing a semi-automated user-centric interface to incoming reports of disaster. This presentation examines the motivation behind developing wearable tools for disaster response in the world's fastest growing city, and explores the software's underlying open source geospatial technologies.