The analysis also looks at the pros and cons for each item. We took an in-depth look at the data for the North Coast. KEY RESULTS Â â Cudgen Beach, Kingscliff: 12 sharks sighted, 0 beach evacuations â Main Beach, Byron Bay: 49 sharks sighted, 4 beach evacuations â The Pass, Byron Bay: 46 sharks sighted, 0 beach evacuations â Suffolk Park: 8 sharks sighted, 0 beach evacuations â Lennox Head: 19 sharks sighted, 3 beach evacuations â Sharpes Beach, Ballina: 41 sharks sighted, 7 beach evacuations â Shelly Beach, Ballina: 25 sharks sighted, 10 beach evacuations â Lighthouse Beach, Ballina: 35 sharks sighted, 3 beach evacuations â Evans Head: 58 sharks sighted, 7 beach evacuations. PROS: No impacts to sharks or other marine animals, comparatively cheap and easy to operate, in the future automated software and flight paths will be able to detect sharks, targeted flights over a single beach and for events, rapid response and general beach surveillance, help beach authorities to monitor the shark, versatility of drones as a multipurpose surveillance and rescue tool, potential to drop life saving devices to water