Hi I have used the trail period on ReefMaster which work well but now I have just activated sonar view and every time I try to add a file program freezes up and closes down. File I have tried uploading is .sl3 , then rename it to .sl2 with no joy. I am using a Mac book with parallels. Help is needed

The Sonar Viewer requires hardware graphics acceleration to run, and doesn't work under Parallels. Did you trial ReefMaster or the Sonar Viewer before purchase? ReefMaster will work under Parallels. It is possible to run the Sonar Viewer using Boot Camp, if that is an option.

Yes ReefMaster did work under trail using windows 10 in parallels. I will try Boot Camp. Cheers for your reply