Thanks @Purnendu da. 20K would be too expensive. We do not need hand held GPS, but some cheap data loggers which with give the trajectory. Also you can suggest if the battery life can be extended by add ons.

We were using two bettaries in parllel mode

We were using two bettaries in parllel mode

Thanks Kutubuddin Ansari for your suggestion.

your welcome

could you tell me what is the accuracy you are looking for?

Hayder Dibs We need to register fishing ranges. So much accuracy is not required. Ability to record over 1,50,000 logs will work well.

Dear Sohom Seal, from my point of view any handy GPS will be enough to your work such as Garmin 76s or even your GPS over your cellphone

my regards