SeaNav app im­prove­ment

Practical Boat Owner - - New Gear -

Pocket Mariner has added an air draught aug­mented re­al­ity (AR) fea­ture to its SeaNav app, which may in­ter­est PBO read­ers. Users can se­lect a SeaNav POI (point of in­ter­est) marker for a bridge (or cable) on the SeaNav map view, set their boat’s air draught in SeaNav’s set­tings and see this as they ap­proach the bridge in AR view mode.

Pic­tured is one of the three low bridges Pocket Mariner founder and CEO Steve Ben­nett has to pass be­neath on a tidal river around high tide (12m at Springs) to reach the Bris­tol Chan­nel from his boat’s moor­ing. With the hori­zon line lined up with the sea level at the bottom of the bridge, the bold red line shows the height of your boat at the bridge.

The lat­est Ap­ple iOS now pro­vides Field of View pa­ram­e­ters which en­ables the rel­a­tive draw­ing cal­cu­la­tions to be done on all de­vices. The app could also show your boat’s width at the point.

Steve sug­gests that users ‘cal­i­brate’ their air draught by set­ting it then view­ing their own boat at a dis­tance of 200ft or so. This must only be used as a guide, not solely re­lied upon, and the cap­tain’s de­ci­sion to pass un­der a bridge should be based on their own judge­ment.

The SeaNav POI fea­ture comes with the free ver­sion of the SeaNav app: air draught is now in­cluded with SeaNav Pro in-app pur­chases, priced at £9.99, which adds AR and live ship AIS po­si­tions.

■ http://pock­et­

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