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Even more importantly, from a scientific point of view we can use the depth and temperature data generated by the fish-finder as part of the environmental data we collect at dolphin sightings to help build up a model of their habitat use patterns.
Last year I asked Garmin South Africa (run by Avnic Trading locally) if they would sponsor us a small GPS / Fishfinder unit for the boat, and they've agreed! I'm currently sitting with the new 'toy' in my hands, a 420S and will be fitting it to the boat as soon as we get to Namibia at the end of the month.
A big thank you to Fraser McHenry at Garmin South Africa