Skyamsen, if you plan to have both, buy GPS first. It will assist you in much more activities and information regarding navigation. Although limited for trim use, it can provide lots of useful information like VMG to a point. Then, when budget allow, you improve and fine tune your trim by using a knotmeter. These unities are good for relative speed in short term, as those paddle trying to measure your velocity is simply unacurate for absolute readings.
Beneteau Oceanis 43
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