Adding a set of waypoints or marks in SeaNav

Here is how to import a list of Latitude and Longitude positions as a set of waypoints and route  into SeaNav.

Step 1. Create a spreadsheet with the Latitudes and Longitudes either in Degrees, Minutes, Seconds or Decimal degrees with a header line including latitude and longitude like so:-

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One caveat – If your co-ordinates are West of the meridian like mine are you will need to enter them as negative values before dropping on the kml converter! Ditto south of the equator.

I use google docs to create the spreadsheet and then download it as a csv or excel spreadsheet to my desktop.

Step 2. Next use this excellent free online converter tool at

If you have entered the co-ordinates in decimal degrees then you can just drag and drop the xls/cvs  file you have just created and downloaded onto the kml converter tool:-

Screen Shot 2014-07-04 at 16.10.10

But if like me you use DD MM SS  (Degrees, Minutes, Seconds)  then you need to use their Convert DMS to decimal” tool first. Drag your xls/csv file onto it , edit the resulting csv file to change the existing DMS latitude and longitude fields to a different name, e.g. dmslatitude etc. and then drop the resulting file onto the KML Converter box above.

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Step 3. Convert the kml to a kmz file. Simply compress/zip the resulting kml file and rename the extension from .zip to .kmz.

e.g. ClubMarks.kml -zip->  -re-name-> ClubMarks.kmz

and then email the kmz to yourself so you can pick it up in email on your iPhone.

Open it in the iPhone email client. Here are screenshots of the final step of the import process:-

Open the email and tap the kmz icon.


Press the button at the top right to import the file.



Select your flavor of SeaNav (UK, US ) from the list of options to open the file with:-



And there are the three waypoints in SeaNav:-


Here is a set of Club marks for the Marina Del Rey Yacht club created using the technique above and displayed in google earth and in SeaNav






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