The post by AdamBo touches on a major concern of mine. Although I have several kayaking acquaintances, scheduling problems often leave me kayaking solo. My playground, the Chesapeak Bay, is not exactly a raging malestrom but there are times when I would rather not be alone out there. My safety measures include checking the weather report, carrying flares, VHF, GPS, compass, extra paddle, paddle float, pump, bailout bag, etc. I don't have a reliable roll, but I practice self-rescues.
Any advice, experiences, or comments on solo kayaking?