How do I download my saved waypoints from my watch to a csv file?

Sync Instinct with Basecamp.  Select waypoints in Basecamp and export as csv.

https://www.alltrails.com/converter  is able to convert GARMIN\Location\Lctns.fit  to GPX (check "Waypoints ").

<?xml version="1.0" encoding="UTF-8"?>
<gpx xmlns="http://www.topografix.com/GPX/1/1" creator="AllTrails https://www.alltrails.com/ - Lctns" version="1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd">
  <wpt lat="51.47725598" lon="0.000000922">
    <ele>49.000000</ele>
    <name>Greenwich ele46</name>
    <sym>Waypoint</sym>
  </wpt>
  <wpt lat="89.99999899" lon="0.000000922">
    <ele>0.0000000</ele>
    <name>North pole ele2</name>
    <sym>Waypoint</sym>
  </wpt>
  <wpt lat="-89.9999989" lon="0.000000922">
    <ele>2698.0000</ele>
    <name>South pole 2835</name>
    <sym>Waypoint</sym>
  </wpt>
  <wpt lat="31.75932096" lon="35.50390695">
    <ele>-412.0000</ele>
    <name>Elevation unset</name>
    <sym>Waypoint</sym>
  </wpt>
  <wpt lat="53.03739697" lon="107.6859109">
    <ele>450.00000</ele>
    <name>Байкал</name>
    <sym>Waypoint</sym>
  </wpt>
  <wpt lat="52.38667395" lon="13.28754594">
    <ele>46.000000</ele>
    <name>Händelstraße</name>
    <sym>Waypoint</sym>
  </wpt>
  <wpt lat="31.70305592" lon="35.19555592">
    <ele>774.00000</ele>
    <name>בית לחם</name>
    <sym>Waypoint</sym>
  </wpt>
  <wpt lat="29.31482699" lon="47.70962194">
    <ele>24.000000</ele>
    <name>الكويت</name>
    <sym>Waypoint</sym>
  </wpt>
  <wpt lat="39.16105695" lon="20.98391094">
    <ele>37.000000</ele>
    <name>Θέατρο</name>
    <sym>Waypoint</sym>
  </wpt>
</gpx>